JP2001069218A - Interphone device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a case where no ring tone is produced to a mischievous switch-on operation by providing the 1st and 2nd hook switches of an indoor master unit, connecting these two switches in series, locating both switches so as not to be easily pushed at a time by a single hand and making these switches serve as a ring tone sounding speaker and a handset receiver respectively. SOLUTION: When a resident takes up a handset 8 after calling, the 1st and 2nd switches 7a and 7b of a hook switch 7 are turned off. Then a talking circuit 3 inhibits the talking with a ring tone generation circuit 5 nor the talking with a door slave unit 1 either. When the talking is permitted with the unit 1, a talking state is secured. When the handset 8 is set in its original state after the talking is over, the switch 7 is turned on and the circuit 3 stops its operation to end the talking with the unit 1. Thus, no ring tone is produced as long as both switches 7a and 7b are turned on at a time even though the handset 8 is taken up and the switch 7 is mischievously turned on.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intercom apparatus, and more particularly, to a ringing speaker and a handset having a structure in which two hook switches of an indoor master unit are connected in series and are not easily pressed with one hand. The present invention relates to an intercom apparatus characterized in that it also serves as a receiver.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional intercom apparatus.
The conventional intercom apparatus is composed of an entrance slave unit 51 and an indoor master unit 5.
2, each of which is connected by a line through a terminal. The indoor master unit 52 is composed of a main body including a terminal connected to the entrance slave unit 51 and a handset 58. The main unit includes a call detection circuit 54 for detecting a call when called from the entrance slave unit 51; A ringing tone generating circuit 55 for generating a tone, a ringing tone speaker 56 for ringing a ringing tone connected thereto, a hook switch 57 for notifying the start and end of a call, an entrance slave unit 51 and an indoor master unit 52 during a call. And a communication circuit 53 for enabling communication between the receiver 59 and the handset 58 having the microphone 60.

Next, the operation of the conventional intercom apparatus will be described. When there is a call from the entrance device 51, a call is detected by a call detection circuit 54, and a ringing sound is emitted from a ringing sound speaker 56 through a ringing sound generation circuit 55. At this time,
Since the hook switch 57 is on, the communication circuit 53
Is not established, and no ringing tone sounds from the receiver 59 of the handset 58. After the call, the occupant raises the handset 58 to turn off the hook switch 57, and the communication circuit 53 starts operating to enter a call state. At the end of the call, by lowering the handset 58, the hook switch 57 is turned on, the call circuit 53 stops operating, and the call ends.

[0004]

In a conventional intercom apparatus, a hook switch is turned on unnecessarily,
When the handset is brought to the ear and a ringing tone is heard from the receiver, the ear may be damaged. Therefore, it is necessary to provide a ringing speaker separately from the receiver.
As a result, the structure of the housing of the main body becomes complicated, and not only the number of components increases, but also the cost of the product as a whole increases. The present invention has been made in order to solve the above-mentioned difficulties, and an object of the present invention is to provide an intercom apparatus in which a ringing tone is not emitted from a receiver of a handset without detecting an on state even if a hook switch is unnecessarily turned on. And

[0005]

In order to achieve such an object, an intercom apparatus according to the present invention is provided with two hook switches of an indoor master unit, a first switch and a second switch, which are connected in series, and It is characterized in that two arrangements cannot be easily pressed with one hand at the same time, and the ringing speaker and the handset receiver are also used.

In this intercom apparatus, even if the hook switch is turned on unnecessarily, the two switches are not pressed to be simultaneously pressed to detect the on state. Therefore, even if a call is detected, no ringing tone sounds at the ear and the ear is not damaged. Can be completed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment to which an intercom apparatus according to the present invention is applied will be described below as an embodiment with reference to the drawings.

The intercom apparatus shown in the block diagram of FIG. 1A is composed of an entrance slave unit 1 and an indoor master unit 2. The indoor master unit 2 includes a main body and a handset 8, and the main body is called from the entrance slave unit 1. A call detection circuit 4 for detecting a call when a call is made, a ring tone generation circuit 5 for generating a ring tone after detection,
A hook switch 7 for notifying the start and end of a call, a receiver 9 and a microphone 10 of the entrance slave unit 1 and the indoor master unit 2 at the time of a call
And a communication circuit 3 for enabling communication between handsets 8 having The hook switch 7 includes a first switch 7a and a second switch 7b connected in series. FIG. 1B shows an example of an arrangement of two switches. In order to arrange the first switch 7a and the second switch 7b so that they cannot be easily pressed at the same time, the first switch 7a is a hook switch having the same arrangement as the conventional one, and the second switch 7b is installed near the bottom of the main body. The handset 8 is provided with protrusions 8a and 8b having a structure that presses the hook switches 7a and 7b, so that the hook switch 7 is turned on and off. The same effect can be obtained by arranging two switches of the hook switches 7a and 7b in the depth of the hole which cannot be pressed unless the rod is a thin rod.

Next, the operation of the intercom apparatus of the present invention will be described. When there is a call from the entrance cordless handset 1, the call is detected by the call detection circuit 4 of the indoor master unit 2, the call sound generation circuit 5 sends the call sound from the receiver 9 of the handset 8 through the communication circuit 3. At this time, since both the first switch 7a and the second switch 7b of the hook switch 7 are turned on, the communication with the entrance device 1 of the communication circuit 3 is not established. After the call, when the resident raises the handset 8, both the first switch 7a and the second switch 7b of the hook switch 7 are turned off, and the telephone conversation circuit 3
Is not established, a call is established with the handset 1 and a call state is established. At the end of the call, the hook switch 7 is turned on by lowering the handset 8, the call circuit 3 stops operating, and the call with the entrance slave unit 1 is ended. Also, when the hook switch is turned on unnecessarily while the handset 8 is raised, the first switch 7a and the second switch 7b are connected in series. Since the turning-on of the switch 7 is not detected, no ringing tone is output from the receiver 9 of the handset 8, and no loud ringing tone sounds at the ear.

[0010]

As is apparent from the above description, according to the intercom apparatus of the present invention, even if the hook switch is turned on unnecessarily while the handset is raised, the intercom apparatus does not detect the on-state, but calls from the receiver of the handset. Sound can be suppressed.

[Brief description of the drawings]

FIG. 1A is a block diagram showing an embodiment of an intercom apparatus according to the present invention. (B) is a structural diagram showing an embodiment of an intercom apparatus according to the present invention.

FIG. 2 is a block diagram showing a conventional intercom apparatus.

[Explanation of symbols]

 2 Indoor indoor unit 7 Hook switch 7a First switch 7b Second switch 8 Handset 9 Receiver

Claims (1)

[Claims] A first switch (7a) and a second switch (7b) are provided in series with a hook switch (7) of an indoor master unit (2) and are connected in series. An intercom apparatus characterized in that the intercom apparatus has a structure that cannot be pressed by a user and serves as a ringing speaker and a receiver (9) of the handset (8).