JPS6229252A - Key telephone set - Google Patents

Abstract

PURPOSE:To halve extension keys of a key telephone set by adding a shift key and a shift contact group interlocked therewith. CONSTITUTION:The shift key group 2 consists of plural shift contacts switched simultaneously every depression of a shift key and switched to the make and break contacts M, B at every depression of the shift key. Further, each common terminal C is connected to a contact group switched in interlocking with the extension keyhs and each make contact and each break contact are connected to a recognition circuit 4. The number of extension keys is equal to a half number of set number of key telephone sets connected to a master set and one extension key calls two key telephone sets. That is, when an extension key is depressed while the shift contact group 2 is switched to the break position, one extension key telephone set is called and in depressing the same extension key while the shift contact group 2 is switched to the make position, the other extension key telephone set is called.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a button telephone, and in particular, a group of extension buttons for directly calling each extension button telephone, and a switch that closes in response to pressing of each circle button. The present invention relates to a button telephone equipped with a contact group and a recognition circuit that recognizes the open/closed state of each switch contact by detecting the presence or absence of a current flowing through each switch contact of the switch contact group.

[Conventional technology]

Conventionally, this type of button telephone has the following features as shown in Fig. 2.
A contact group 5 that opens and closes in conjunction with the extension button, and an evening recognition circuit 4 that recognizes the open/closed state of each contact based on the presence or absence of current from the power supply terminal VCC and outputs a recognition number 6; The boat group, which is an interface for each contact point, and each contact point of the contact group 5 have a one-to-one correspondence.The 0 recognition signal 6 is usually converted into data by the data transmitting/receiving section of the button telephone. It is sent to the main device. As a result, the main device forms a communication path between the caller and callee key telephones.

[The problem that the invention is trying to solve]

The conventional button telephone Fa described above has the same number of contact groups and extension button groups as the recognition circuit board groups. Therefore, in a large system, each key telephone has a large number of extension buttons, and the number of parts increases. In addition, the size and spacing of each button are determined so that two buttons cannot be pressed at the same time, so the increase in the number of extension buttons becomes an obstacle to miniaturizing key telephones.

Furthermore, the increase in the number of buttons complicates the appearance of the button telephone, giving the user the impression that the operation is complicated.

[Means for solving problems]

According to the present invention, there is a group of extension buttons for directly calling each extension telephone, a group of switch contacts that close in response to pressing of each extension button, and whether or not current flows through each switch contact of the group of switch contacts. In a button telephone, the button telephone includes a recognition circuit that recognizes the open/closed state of each switch contact by detecting all the contacts and generates a signal for calling an extension.
It includes a shift button and a shift contact group consisting of a plurality of shift contacts that are switched simultaneously by pressing the shift button, and the shift contact group is connected between the switch contact group and the recognition circuit, and the shift contact group is connected between the switch contact group and the recognition circuit, and the shift contact group is connected between the switch contact group and the recognition circuit. A button telephone is obtained, characterized in that the recognition circuit recognizes calls of another extension telephone.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, in which the well-known dialing circuit 1 and the calling circuit network are omitted. In FIG.
It consists of a plurality of shift contacts that are simultaneously switched by pressing the shift button (not shown), and is switched to a make contact M and a break contact B each time the shift button t is pressed once. Each common terminal C of the shift contact group 2 is connected to a contact group 3 that opens and closes in conjunction with an extension button (not shown), and each make contact and each break contact of the shift contact group 2 is connected to a recognition circuit 4.
connected to.

The number of extension buttons is equal to half the number of key telephones connected to the main unit, so that one extension button can call two key telephones. In other words, if you press the extension button with the shift contact group set to the 2T break side without pressing the shift button, one of the extension button telephones will call and press the n% shift button to set the shift contact group 2T make side. If the same extension button is pressed in this state, the other extension button telephone will be called.

When the shift contact group 2 is connected to the make contact side, when the extension button is pressed, the contact linked to this closes, and the recognition circuit 4 connected to the make contact side of the shift contact group 2 is activated. Current from current terminal vcc is detected through the boat. When the shift circuit 2 is connected to the break contact side, conversely, the recognition circuit 4 connected to the break contact side
A current is detected through the boat. Which boat in recognition circuit 4? A current is detected through the circuit, and an identification signal (6 purple) is generated accordingly. This key number becomes extension call data in the data transmitting/receiving section within the key telephone. Based on the data, the main device forms a communication path between the key telephone that made the extension call and the called party's key telephone. It should be noted that the main device for forming a communication path by calling an extension is well known, and therefore a complete explanation with illustrations will be omitted.

〔Effect of the invention〕

As described above, the present invention can reduce the number of extension buttons on a key telephone by half by adding a shift button and a group of shift contacts linked thereto. As a result, the number of parts for the extension button and the contacts linked to it can be halved compared to conventional ones, which not only reduces costs, but also reduces the mounting area of each component, making it possible to miniaturize button telephones. be. In addition, the number of extension buttons has been reduced, making the appearance of the telephone more simple, giving the user an impression of improved operability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional configuration. 2... Contact group, 3, 5... Contact group, 4
...Recognition circuit. Agent: Susumu Susumu Hara”＼−6・′ 8 l Prisoner: 2 prisoners

Claims (1)

[Scope of Claims] A group of extension buttons for directly calling each extension telephone connected to a main device that forms a call path, a group of switch contacts that close in response to pressing of each extension button, and a group of switch contacts. A shift button; and a recognition circuit that recognizes the open/closed state of each switch contact by detecting the presence or absence of current flowing through each switch contact and generates a signal for calling an extension. a shift contact group consisting of a plurality of shift contacts that are switched simultaneously by pressing the switch, the shift contact group is connected between the switch contact group and the recognition circuit, and the recognition circuit is activated by switching the shift contact. A button-j telephone characterized in that it recognizes the call of another extension telephone.