JPS5852769Y2 - button telephone device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a button telephone device that skillfully controls lamp lighting to reduce power consumption.In conventional button telephone devices, the line status display lamp is used even when the telephone is in use. The lights are turned on even when they are not turned on, resulting in unnecessary power consumption.

In general, the maximum number of button telephones in normal use is one-half to one-third of the number of installed button telephones.

In other words, a wasteful current that is two to three times the required current is flowing.

The present invention is intended to eliminate the above-mentioned drawbacks, and one embodiment thereof will be described below with reference to the drawings.

In the drawing, K is the button telephone main unit, T is the button telephone, 1, 2 to n are status display lamps for each line, and A is an incoming call detection circuit, which operates when a call is received and makes the ringer amplifier B sound to make the call. At the same time, the lamp lighting control circuit C is operated.

D is a hook switch or a switch that works in conjunction with a hook switch, and is activated when the handset is raised.

E is a contact point of the control circuit C, and F is a special locking or non-locking electric key.

Note that S is a power supply line, C□ to Cn are control lines, and q is a call line.

Next, the operation of this embodiment will be explained.

Although power for the lamp is supplied from the main device K, a hook switch D is activated inside the button telephone T.

Since contacts E and key F are open, lamp T will not light up even if a certain line is in use and earth is being sent to that lamp line.

In this case, even if you try to make a call, the lamp is not lit, so it is impossible to determine which line is open.

However, by raising the handset, the hook switch D closes and the lamp lights up, making it possible to identify an idle line.

In addition, when there is an incoming call and the called party answers, a signal is sent from the calling line 8, and the incoming call detection circuit A drives the amplifier B. At the same time as a ringing tone is generated, the lamp lighting control circuit C is driven, and the contact E is turned on. Close it and the lamp will light up.

If you want to keep the lamp on all the time and monitor the usage status of the line, you can turn on the special function key and close F.

As is clear from the above embodiments, according to this invention, the lamp of a button telephone that is not in use can be turned off during normal times, and the capacity of the power supply of the button telephone device can be reduced.

At the same time, the user is also freed from the visual annoyance caused by the flashing lamps of unused telephones.

[Brief explanation of the drawing]

The drawing is a block diagram of a button telephone device according to an embodiment of the present invention. T...Button telephone, D...Hook switch, E...Contact, 1-n...Status display lamp, C1-Cn...・Control line.

Claims (1)

[Scope of utility model registration request] One end of each line status display lamp is connected to each control line provided for each line, the other end of these lamps is made common, and this common point is connected to a hook switch that operates at least when the handset is lifted. The telephone is connected to the power supply line through a parallel circuit with a switching element operated under the control of the incoming call detection circuit, and the display lamps are configured so that none of the above-mentioned indicator lamps will light up on an unused telephone even if another telephone is in use. button telephone device.