JPS6225009Y2 - - Google Patents
Info
- Publication number
- JPS6225009Y2 JPS6225009Y2 JP1979183307U JP18330779U JPS6225009Y2 JP S6225009 Y2 JPS6225009 Y2 JP S6225009Y2 JP 1979183307 U JP1979183307 U JP 1979183307U JP 18330779 U JP18330779 U JP 18330779U JP S6225009 Y2 JPS6225009 Y2 JP S6225009Y2
- Authority
- JP
- Japan
- Prior art keywords
- door intercom
- wire
- intercom handset
- handset
- door
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 4
- 230000005236 sound signal Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
Landscapes
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Description
【考案の詳細な説明】
本考案はドアホン子機の接続回路に関する。例
えば各家庭の玄関や勝手口にドアホン子機を取り
付け、ボタン電話機により来客等と通話できるよ
うにした装置としてボタン電話装置が存在する。[Detailed Description of the Invention] The present invention relates to a connection circuit for a door intercom handset. For example, a button telephone device exists as a device in which a door intercom slave is attached to the front door or back door of each home, and the button telephone can be used to talk to guests.
このような装置では第１図に示すようにドアホ
ン子機１の２個の接続端子２，３と主装置内の２
線−４線変換回路４の２線側の２個の接続端子
５，６との間を２線の通話路７，８で接続してい
る。そして２線−４線変換回路４の受信側入力端
子９，１０には図示しないボタン電話機から図示
しない２線−４線変換回路および増幅器１１を経
て供給される信号を入力させる。またドアホン子
機１から２線−４線変換回路４の送信側出力端子
１２，１３へ供給される信号は、増幅器１４によ
り増幅された後前記した図示しない２線−４線変
換回路を経て同じく前記したボタン電話機へ供給
される。 In such a device, as shown in FIG.
Two connection terminals 5 and 6 on the 2-wire side of the line-to-4-wire conversion circuit 4 are connected by 2-wire communication paths 7 and 8. The reception side input terminals 9 and 10 of the 2-wire to 4-wire conversion circuit 4 are supplied with a signal supplied from a button telephone (not shown) via a 2-wire to 4-wire conversion circuit and an amplifier 11 (not shown). Further, the signals supplied from the intercom handset 1 to the transmitting side output terminals 12 and 13 of the 2-wire to 4-wire conversion circuit 4 are amplified by the amplifier 14 and then passed through the 2-wire to 4-wire conversion circuit (not shown) described above. It is supplied to the above-mentioned button telephone.
ところでドアホン子機１の接続端子２，３には
送受話装置１５と抵抗１６および呼出しスイツチ
１７を直列接続した呼出回路とが接続されてい
る。呼出しスイツチ１７はドアホン子機１の扱者
が呼出しスイツチ１７を押したときのみ接点が閉
じるメーク接点を持つたスイツチである。２個の
接続端子２，３の間には常時所定の電圧が印加さ
れており、扱者が呼出スイツチ１７を押すと、こ
れによる出力端子２または３に現われた電位変化
が主装置側の図示しない検出回路によつて検出さ
れる。これにより主装置は、すべてのボタン電話
機あるいは予め定められた特定のボタン電話機に
呼出信号を送出し、ボタン電話機とドアホン子機
との間で通話を行わせる。 By the way, the connection terminals 2 and 3 of the intercom handset 1 are connected to a calling circuit in which a transmitting/receiving device 15, a resistor 16, and a calling switch 17 are connected in series. The call switch 17 is a switch having a make contact that closes only when the operator of the door intercom handset 1 presses the call switch 17. A predetermined voltage is always applied between the two connection terminals 2 and 3, and when the operator presses the call switch 17, the resulting change in potential that appears at the output terminal 2 or 3 is displayed in the diagram on the main device side. detected by a detection circuit that does not As a result, the main device sends a calling signal to all the key telephones or a predetermined specific key telephone, and allows a call to be made between the key telephones and the door intercom handset.
さてボタン電話装置に複数台のドアホン子機が
接続されている場合、これらのドアホン子機を１
組の接続端子５，６に共通して接続する必要があ
る。この条件の下に各ドアホン子機に呼出し検知
のための直流ループを形成させ、また呼出しの行
われたドアホン子機と主装置との間で通話路を形
成させるためには、従来各ドアホン子機に対して
計２個ずつのブレーク接点やメーク接点を用いて
いた。このためドアホン子機の接続される台数が
増加すると接点が多くなるばかりでなく回路が複
雑化し、ドアホン機の拡張を容易に行えないとい
う問題があつた。 Now, if multiple door intercom handsets are connected to the button telephone device, these door intercom handsets can be connected to one
It is necessary to connect the pair of connection terminals 5 and 6 in common. Under these conditions, in order to form a DC loop in each door intercom handset for call detection, and to form a communication path between the door intercom handset and the main device where a call was made, conventionally each door intercom handset had to A total of two break contacts and two make contacts were used for each machine. For this reason, when the number of connected door intercom handsets increases, not only do the number of contacts increase, but the circuit becomes complicated, creating a problem in that the door intercom handset cannot be easily expanded.
本考案は、このような事情に鑑みてなされたも
ので、接点数を大幅に減少させることのできるド
アホン子機の接続回路を提供することを目的とす
る。 The present invention has been developed in view of the above circumstances, and an object of the present invention is to provide a connection circuit for a door intercom slave unit that can significantly reduce the number of contacts.
本考案では高抵抗を介した電源から各ドアホン
子機へ呼出し検知のための直流を供給することと
して、この呼出し検知のための回路にドアホン子
機の数だけ必要とした接点を徹廃する一方、２線
−４線変換回路の２線側の端子の一方に直流阻止
用のコンデンサを接続し、このコンデンサを介し
て交流信号のみを伝達させることとしてこの目的
を達成する。 In this invention, by supplying direct current for call detection to each door intercom handset from a power supply via a high resistance, the circuit for detecting calls eliminates the number of contacts required for the number of door intercom handsets. This object is achieved by connecting a DC blocking capacitor to one of the terminals on the 2-wire side of the 2-wire to 4-wire conversion circuit and transmitting only the AC signal via this capacitor.
以下実施例につき本考案を詳細に説明する。 The present invention will be described in detail with reference to Examples below.
第１図と同一部分には同一の符号を付した第２
図において、Ｎ台のドアホン子機１Ａ〜１Ｎの一
方の接続端子２Ａ〜2Nは、それぞれメーク接点
を持つスイツチング素子２１Ａ〜２１Ｎを介して
共通接続端子２２に接続されている。この共通接
続端子２２は直流阻止用のコンデンサ２３を介し
て２線−４線変換回路４の２線側の接続端子５に
交流的に接続されると共に、ドアホン子機の送受
話装置作動電流供給用の抵抗２４を介して電源
２５に接続されている。一方、ドアホン子機１Ａ
〜１Ｎの他方の接続端子３Ａ〜３Ｎはそれぞれ共
通接続されて接地されており、２線−４線変換回
路４の他方の接続端子６も接地されている。また
各ドアホン子機が呼出しスイツチ１７Ａ〜１７Ｎ
を押したかどうかを検出する電位検出端子２６Ａ
〜２６Ｎは、電位検出用の高抵抗２７Ａ〜２７Ｎ
を介して電源２５に接続されると共に、各対応
する接続端子２Ａ〜２Ｎに接続されている。 The same parts as in Fig. 1 are given the same reference numerals as in Fig. 2.
In the figure, one connection terminals 2A to 2N of N doorphone handsets 1A to 1N are connected to a common connection terminal 22 via switching elements 21A to 21N each having a make contact. This common connection terminal 22 is AC connected to the connection terminal 5 on the 2-wire side of the 2-wire to 4-wire conversion circuit 4 via a DC blocking capacitor 23, and also supplies operating current to the transmitter/receiver of the intercom handset. It is connected to a power supply 25 via a resistor 24 for use. On the other hand, door phone handset 1A
The other connecting terminals 3A to 3N of ~1N are commonly connected and grounded, and the other connecting terminal 6 of the 2-wire to 4-wire conversion circuit 4 is also grounded. In addition, each doorphone handset has a call switch 17A to 17N.
Potential detection terminal 26A that detects whether or not is pressed
~26N is a high resistance for potential detection 27A~27N
It is connected to the power supply 25 via the power source 25, and is also connected to the corresponding connection terminals 2A to 2N.
さて各ドアホン機１Ａ〜１Ｎが共に呼出し待の
状態にあるとき、総てのスイツチング素子２１Ａ
〜２１Ｎの接点は開いている。このとき電源２
５はいずれのドアホン子機１Ａ〜１Ｎに対しても
ドアホン子機の送受話装置作動電流供給用の抵抗
２４を介して直流電流を供給することができな
い。もちろん直流阻止用のコンデンサ２３の存在
により、電源２５は接続端子５に対しても直流
電流を供給することができない。従つてこの状態
では高抵抗２７Ａ〜２７Ｎを介して電源２５から
各ドアホン子機１Ａ〜１Ｎに直流電流が供給され
る。このとき各ドアホン子機内の送受話装置１５
Ａ〜１５Ｎにはその内部抵抗のために微小な電流
しか流れず、送受話装置１５Ａ〜１５Ｎは不完全
に作動する状態に保たれる。この状態では電位検
出端子２６Ａの電位も高い。 Now, when each door intercom device 1A to 1N is in the state of waiting for a call, all the switching elements 21A
~21N contacts are open. At this time, power supply 2
5 cannot supply direct current to any of the door intercom handsets 1A to 1N via the resistor 24 for supplying operating current to the transmitting/receiving device of the door intercom handset. Of course, due to the presence of the DC blocking capacitor 23, the power supply 25 cannot supply DC current to the connection terminal 5 either. Therefore, in this state, DC current is supplied from the power supply 25 to each door intercom handset 1A to 1N via the high resistances 27A to 27N. At this time, the transmitting/receiving device 15 in each door intercom handset
Only a small current flows through A to 15N due to their internal resistance, and the transmitting/receiving devices 15A to 15N are kept in a state of incomplete operation. In this state, the potential of the potential detection terminal 26A is also high.
この状態で例えば第１のボタン電話機１Ａ内の
呼出スイツチ１７Ａが押されると、比較的低い抵
抗値に設定された抵抗１６Ａを通じて電源２５
からドアホン子機１Ａへ電流が流れ、これにより
高抵抗２７Ａによる電圧降下が増大し、電位検出
端子２６Ａの電位は低下する。主装置はこの電位
変化を検出して該当するドアホン子機１Ａの呼出
しを検出することができる。 In this state, for example, when the call switch 17A in the first button telephone 1A is pressed, the power supply 25
A current flows from the door intercom handset 1A to the door intercom handset 1A, thereby increasing the voltage drop due to the high resistance 27A and lowering the potential of the potential detection terminal 26A. The main device can detect this potential change and detect a call from the corresponding intercom slave unit 1A.
主装置は電位検出端子２６Ａの電位の低下を検
出すると、図示しないボタン電話機へ呼出信号を
送出すると共に、ドアホン子機１Ａに対応するス
イツチング素子２１Ａを作動させ、その接点を閉
じさせる。これにより電源２５から比較的低い
抵抗値に設定された抵抗２４を経て、送受話装置
１５Ａに充分な量の直流電流が供給される。この
段階から送受話装置１５Ａは正常な動作を開始さ
せ、通話可能な状態となる。 When the main device detects a drop in the potential of the potential detection terminal 26A, it sends a calling signal to a button telephone (not shown) and activates the switching element 21A corresponding to the door intercom handset 1A to close its contact. As a result, a sufficient amount of direct current is supplied from the power supply 25 to the handset 15A via the resistor 24 whose resistance value is set to a relatively low value. From this stage, the transmitting/receiving device 15A starts normal operation and becomes ready for conversation.
ボタン電話機との間で通話が開始されると、ド
アホン子機１Ａの接続端子２Ａから送り出される
音声信号はスイツチング素子２１Ａおよびコンデ
ンサ２３を経て２線−４線変換回路４の接続端子
２５へ入力される。そして２線−４線変換回路の
１例として示すハイブリツドトランス２９の２次
巻線およびこれと直列に接続された平衡回路網３
０を経て送信側出力端子１３および接続端子６へ
供給される。ハイブリツトトランス２９の２次巻
線の中点は他の送信側出力端子１２に接続されて
おり、これらの接続端子１２，１３へ供給された
音声信号は主装置内の増幅器１４により増幅され
た後、該当するボタン電話機へ供給される。 When a conversation with the key telephone is started, the audio signal sent from the connection terminal 2A of the door intercom handset 1A is input to the connection terminal 25 of the 2-wire to 4-wire conversion circuit 4 via the switching element 21A and the capacitor 23. Ru. A secondary winding of a hybrid transformer 29 shown as an example of a 2-wire to 4-wire conversion circuit and a balanced circuit network 3 connected in series therewith.
0 to the transmission side output terminal 13 and the connection terminal 6. The middle point of the secondary winding of the hybrid transformer 29 is connected to the other transmitter output terminal 12, and the audio signals supplied to these connection terminals 12 and 13 are amplified by the amplifier 14 in the main device. After that, it is supplied to the corresponding key telephone.
また、このボタン電話機から供給された音声信
号は主装置内の増幅器１１により増幅されさ後２
線−４線変換回路の受信側入力端子９，１０へ供
給される。受信側入力端子９，１０にはハイブリ
ツドトランス２９の１次巻線が接続されており、
受信された音声信号はハイブリツドトランス２９
を介して接続端子５に現われる。そしてコンデン
サ２３およびスイツチング素子２１Ａを通つて送
受話装置１５Ａへ供給される。このとき２線−４
線変換回路４とドアホン子機１Ａはブリツジ回路
を構成する。従つて受信側入力端子９，１０に加
えられる音声信号は送信側出力端子１２，１３に
現われず、ボタン電話装置におけるハウリングが
防止される。 The voice signal supplied from this button telephone is amplified by an amplifier 11 in the main device and then
The signal is supplied to receiving side input terminals 9 and 10 of the line-to-four line conversion circuit. The primary winding of a hybrid transformer 29 is connected to the receiving side input terminals 9 and 10.
The received audio signal is transferred to the hybrid transformer 29.
appears at the connection terminal 5 via. The signal is then supplied to the transmitting/receiving device 15A through the capacitor 23 and the switching element 21A. At this time, 2 lines - 4
The line conversion circuit 4 and the intercom slave unit 1A constitute a bridge circuit. Therefore, the audio signals applied to the receiving side input terminals 9, 10 do not appear on the transmitting side output terminals 12, 13, and howling in the button telephone device is prevented.
このように本考案によれば、呼出し待時におい
て各ドアホン子機の送受話装置には、これらを完
全に動作させるだけの電流が流れない。従つて送
受話装置に過大な音声が入力した場合でつても電
位検出端子の電位は過大な交流信号に振られる虞
れがなく、呼出検出の誤動作を防止することがで
きる。また呼出し待時各ドアホン子機には微小電
流しか流れないため、消費電力が少ないという利
点がある。更に本考案によればドアホン子機を１
台増設するごとにメーク接点が１個増加するだけ
なので、部品点数の削減およびコストの低減が可
能である。なお、電源２５は電源として説明し
たが電源でも構成できることはもちろんであ
る。 As described above, according to the present invention, when waiting for a call, current does not flow through the transmitting/receiving device of each door intercom handset to fully operate them. Therefore, even if an excessive amount of voice is input to the transmitting/receiving device, there is no risk that the potential of the potential detection terminal will be swayed by an excessive AC signal, and erroneous operation of call detection can be prevented. Further, since only a small amount of current flows through each door intercom handset when waiting for a call, there is an advantage that power consumption is low. Furthermore, according to the present invention, one door phone handset
Since the number of make contacts increases by one each time a unit is added, the number of parts and costs can be reduced. Although the power source 25 has been described as a power source, it goes without saying that it can also be configured as a power source.
第１図は１台のドアホン子機の２線−４線変換
回路との接続関係を説明するための原理図、第２
図は本考案の一実施例におけるドアホン子機の接
続状態を示す回路図である。
１……ドアホン子機、２，３……接続端子、４
……２線＝４線変換回路、１６，２４……抵抗、
１７……呼出しスイツチ、２１……スイツチング
素子、２３……コンデンサ、２５……電源、２６
……電位検出端子、２７……高抵抗。
Figure 1 is a principle diagram for explaining the connection relationship between one door intercom handset and a 2-wire to 4-wire conversion circuit.
The figure is a circuit diagram showing a connection state of a door intercom handset according to an embodiment of the present invention. 1...Door phone handset, 2, 3...Connection terminal, 4
...2 wire = 4 wire conversion circuit, 16,24...resistance,
17...Call switch, 21...Switching element, 23...Capacitor, 25...Power supply, 26
...Potential detection terminal, 27...High resistance.
Claims (1)
抵抗と呼出しスイツチとを直列に接続した呼出し
スイツチ回路を接続してなるドアホン子機を複数
台使用し、ドアホン子機の前記各２個の接続端子
間に直流電圧を印加して呼出しスイツチのオンと
なつたドアホン子機の接続端子の一方に生じた電
位変化により当該ドアホン子機を検出すると共
に、前記呼出しスイツチのオンされたドアホン子
機の前記２個の接続端子と主装置内の２線−４線
変換回路の２線側とを交流的に接続して当該ドア
ホン子機とボタン電話機との通話路を形成させる
ボタン電話装置において、各ドアホン子機の前記
接続端子の一方に、電源に接続された高インピー
ダンスの電位検出用の抵抗を接続し、またこれら
の接続端子をそれぞれに対応して設けられた通話
路形成用のメーク接点を介して共通接続し、これ
を送受話装置作動電流供給用の低抵抗を介して電
源に接続させると共に、直流阻止用コンデンサを
介して前記２線−４線変換回路の一方の線路に接
続したことを特徴とするドアホン子機の接続回
路。 Between the two connection terminals connected to the transmitter/receiver,
A plurality of door intercom handsets each having a ring switch circuit in which a resistor and a ring switch are connected in series are used, and a DC voltage is applied between each of the two connection terminals of the door intercom handsets to turn on the ring switch. The door intercom handset is detected by the potential change that occurs in one of the connecting terminals of the door intercom handset, and the two connecting terminals of the door intercom handset with the ring switch turned on and the two wires in the main device are detected. - In a button telephone device that connects the 2-wire side of a 4-wire conversion circuit in an alternating current manner to form a communication path between the door intercom handset and the key telephone, one of the connection terminals of each door intercom handset is connected to a power source. The connected high-impedance potential detection resistors are connected, and these connection terminals are commonly connected through make contacts for forming communication paths, which are connected to the transmitter/receiver operating current. 1. A connection circuit for a door intercom handset, characterized in that it is connected to a power source via a low resistance for supply and also connected to one line of the 2-wire to 4-wire conversion circuit via a DC blocking capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979183307U JPS6225009Y2 (en) | 1979-12-28 | 1979-12-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979183307U JPS6225009Y2 (en) | 1979-12-28 | 1979-12-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5699964U JPS5699964U (en) | 1981-08-06 |
| JPS6225009Y2 true JPS6225009Y2 (en) | 1987-06-26 |
Family
ID=29693610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1979183307U Expired JPS6225009Y2 (en) | 1979-12-28 | 1979-12-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6225009Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4895241B1 (en) * | 2011-01-14 | 2012-03-14 | Ｎｅｃインフロンティア株式会社 | Interface circuit and main device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2403096A1 (en) * | 1974-01-23 | 1975-07-31 | Seckelmann & Co Kg | House telephone system - has outer or main entrance telephone and any number of extensions |
| JPS5113507A (en) * | 1974-07-24 | 1976-02-03 | Matsushita Electric Ind Co Ltd | |
| US3993880A (en) * | 1976-02-09 | 1976-11-23 | Bell Telephone Laboratories, Incorporated | Resistive battery feed for line circuits |
-
1979
- 1979-12-28 JP JP1979183307U patent/JPS6225009Y2/ja not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2403096A1 (en) * | 1974-01-23 | 1975-07-31 | Seckelmann & Co Kg | House telephone system - has outer or main entrance telephone and any number of extensions |
| JPS5113507A (en) * | 1974-07-24 | 1976-02-03 | Matsushita Electric Ind Co Ltd | |
| US3993880A (en) * | 1976-02-09 | 1976-11-23 | Bell Telephone Laboratories, Incorporated | Resistive battery feed for line circuits |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4895241B1 (en) * | 2011-01-14 | 2012-03-14 | Ｎｅｃインフロンティア株式会社 | Interface circuit and main device |
| US8718274B2 (en) | 2011-01-14 | 2014-05-06 | Nec Infrontia Corporation | Interface circuit and main device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5699964U (en) | 1981-08-06 |
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