JPS6134615Y2

JPS6134615Y2 -

Info

Publication number: JPS6134615Y2
Application number: JP8062277U
Authority: JP
Priority date: 1977-06-17
Filing date: 1977-06-17
Publication date: 1986-10-08
Also published as: JPS547609U

Description

【考案の詳細な説明】本考案はラジオ付テープレコーダの信号増幅
器、チユーナー回路、内蔵マイクロフオン回路へ
の駆動電源切換え回路に関するものであり、構成
を簡単化し、部品点数の削減を図つたものであ
る。[Detailed description of the invention] This invention relates to a drive power switching circuit for a signal amplifier, a tuner circuit, and a built-in microphone circuit of a tape recorder with a radio, and is designed to simplify the configuration and reduce the number of parts. be.

内蔵マイクロフオンを有するラジオ付テープレ
コーダに於いて、内蔵マイクロフオンを利用して
録音をする際には、ハウリングを防止する為にモ
ニター回路を不動作状態に設定するよう構成する
必要がある。第１図は斯かる構成を有する従来の
ラジオ付テープレコーダの回路図を示すものであ
る。第１図に於いて１，２，３は信号増幅器、４
はバイアス発振器、５は内蔵マイクロフオン回
路、６はチユーナー回路、７は録音再生用磁気ヘ
ツド、８は外部マイクロフオンジヤツク、９は可
変抵抗器、１０はスピーカ、Ｓ_1-1，Ｓ_1-2，Ｓ_1-
_３，Ｓ_1-4は相互に連動する録音−再生切換えス
イツチ、Ｓ_2-1，Ｓ_2-2は相互に連動するラジオテ
ープ切換えスイツチ、Ｓ_3-1，Ｓ_3-2は相互に連動
する内蔵マイクロフオン切換えスイツチである。
今、スイツチＳ_1-1，Ｓ_1-2，Ｓ_1-3，Ｓ_1-4を録音側
Ｒに転接すると共にスイツチＳ_2-1，Ｓ_2-2をテー
プ側Taに転接し、且つスイツチＳ_3-1，Ｓ_3-2をオ
ン側（ON）に転接した場合には、内蔵マイクロ
フオン回路５から出力された録音信号は、スイツ
チＳ_1-1及び信号増幅器１を通じて磁気ヘツド７
に印加されるが、スイツチＳ_3-1がオン側に転接
していることにより、録音信号が信号増幅器２に
印加されることはなく、従つて、内蔵マイクロフ
オンにより録音をしている際にはモニター動作が
為されることはない。然し乍ら斯かる従来例に於
いては、信号伝送路に挿入されたスイツチにより
モニターのオン・オフ制御を行つている為、これ
らオン・オフスイツチへの配線はハム等を拾わな
いようにシールド線を用いる必要があり、且つス
テレオ装置の場合に於いては右・左各信号伝送路
の夫々についてスイツチを必要とする為、コスト
が高くなるという欠点があつた。 In a tape recorder with a radio that has a built-in microphone, when recording using the built-in microphone, it is necessary to configure the monitor circuit to be inactive in order to prevent howling. FIG. 1 shows a circuit diagram of a conventional tape recorder with radio having such a configuration. In Figure 1, 1, 2, 3 are signal amplifiers, 4
is a bias oscillator, 5 is a built-in microphone circuit, 6 is a tuner circuit, 7 is a magnetic head for recording and playback, 8 is an external microphone jack, 9 is a variable resistor, 10 is a speaker, S _1-1 , S _1-2 , S _1-
₃ , _S1-4 are mutually interlocking recording-playback switching switches, _S2-1 , _S2-2 are mutually interlocking radio tape switching switches, _S3-1 , _S3-2 are mutually interlocking Built-in microphone selector switch.
Now, switch S _1-1 , S _1-2 , S _1-3 , and S _1-4 are connected to the recording side R, and switches S _2-1 and S _2-2 are connected to the tape side Ta. When S _3-1 and S _3-2 are switched to the on side (ON), the recording signal output from the built-in microphone circuit 5 is sent to the magnetic head 7 through the switch S _1-1 and the signal amplifier 1.
However, since the switch _S3-1 is in the ON side, the recording signal is not applied to the signal amplifier 2, and therefore, when recording with the built-in microphone, the recording signal is not applied to the signal amplifier 2. No monitor operation is performed. However, in such a conventional example, the monitor is controlled on and off by a switch inserted in the signal transmission path, so shielded wires are used for wiring to these on/off switches to avoid picking up hum, etc. Moreover, in the case of a stereo system, a switch is required for each of the right and left signal transmission paths, which has the disadvantage of increasing costs.

本考案は斯かる不都合を解消すべく、モニター
動作のオン・オフを信号増幅器に対して駆動電源
を印加するか否かにより制御する構成とすること
により、構成を簡単化し、部品点数の削減を図つ
たものである。 In order to solve this problem, the present invention simplifies the configuration and reduces the number of parts by controlling the on/off of the monitor operation depending on whether or not driving power is applied to the signal amplifier. It's a diagram.

以下、第２図に示す本考案の一実施例を参照し
て詳述する。尚、第２図に於いて、第１図に示す
構成素子と同一の構成素子には同一の図番を付し
てある。 Hereinafter, an embodiment of the present invention shown in FIG. 2 will be described in detail. In FIG. 2, the same components as those shown in FIG. 1 are given the same reference numbers.

(イ) テープ再生の場合スイツチＳ_1-1，Ｓ_1-2，Ｓ_1-3を再生側Ｐに、
スイツチＳ_2-1，Ｓ_2-2をテープ側Taに夫々転接
すれば、信号増幅器２にはスイツチＳ_2-2のテ
ープ側Ta接点−スイツチＳ_1-3の再生側Ｐ接点
を介して＋Ｂ電源が印加されてこの増幅器２は
作動状態となり、以つてテープ再生信号は磁気
ヘツド７−スイツチＳ_1-1−増幅器１−スイツ
チＳ_2-1−増幅器２−可変抵抗器９−増幅器３
−スピーカ１０の経路にて再生される。(b) For tape playback Switches S _1-1 , S _1-2 , and S _1-3 are placed on the playback side P.
If switches S _2-1 and S _2-2 are connected to the tape side Ta, the signal amplifier 2 receives +B via the tape side Ta contact of switch S _2-2 and the playback side P contact of switch S _1-3 . When power is applied, this amplifier 2 is activated, and the tape playback signal is transmitted to the magnetic head 7 - switch S _1-1 - amplifier 1 - switch S _2-1 - amplifier 2 - variable resistor 9 - amplifier 3.
- Reproduced on the path of the speaker 10.

(ロ) ラジオ受信の場合スイツチＳ_2-1，Ｓ_2-2をラジオ側Raに転接す
れば、スイツチＳ_2-2のテープ側Ta接点を介し
てチユーナー回路６及び増幅器２（この場合は
ダイオードＤを経て）に＋Ｂ電源が印加される
ので、チユーナー回路６から出力されるラジオ
受信信号はスイツチＳ_2-1−増幅器２−可変抵
抗器９の経路を経てスピーカ１０より放音され
る。この場合に於いて、スイツチＳ_1-1，Ｓ_1-
_２，Ｓ_1-3を録音側Ｒに転接すれば、ラジオ受
信信号はスイツチＳ_1-1−増幅器１の経路を経
て磁気ヘツド７に印加され、磁気テープに録音
される。(b) For radio reception If switches S _2-1 and _S _2-2 are connected to Ra on the radio side, the tuner circuit 6 and amplifier 2 (in this case, the diode Since the +B power is applied to (via D), the radio reception signal output from the tuner circuit 6 is emitted from the speaker 10 through the path of switch S _2-1 - amplifier 2 - variable resistor 9. In this case, the switches S _1-1 and S _1-
₂ and S _1-3 are connected to the recording side R, the radio reception signal is applied to the magnetic head 7 via the path from switch S _1-1 to amplifier 1, and is recorded on the magnetic tape.

(ハ) 外部マイクロフオン入力信号を録音する場合スイツチＳ_1-1，Ｓ_1-2，Ｓ_1-3を録音側Ｒに、
スイツチＳ_2-1，Ｓ_2-2をテープ側Taに、スイツ
チS₃をオフ側に夫々転接すれば、増幅器２には
スイツチＳ_2-2のテープ側Ta接点−スイツチＳ₁
_−３の録音側Ｒ接点−スイツチS₃のオフ側
（OFF）接点を介して＋Ｂ電源が印加されてこ
の増幅器２は作動状態となる。従つて、外部マ
イクロフオンジヤツク８に入力された信号は、
スイツチＳ_1-1−増幅器１の経路にて磁気ヘツ
ド７に印加されて磁気テープに録音されると共
に、スイツチＳ_2-1−増幅器２−可変抵抗器９
−増幅器３を経てスピーカ１０にも印加され、
モニターが可能となる。(c) When recording external microphone input signals, set switches S _1-1 , S _1-2 , and S _1-3 to the recording side R.
If the switches S _2-1 and S _2-2 are connected to the tape side Ta and the switch S ₃ is connected to the off side, the amplifier 2 has the tape side Ta contact of the switch S _2-2 - the switch S ₁
₊ B power is applied through the recording side R contact of switch _S3 and the OFF side (OFF) contact of switch S3, and the amplifier 2 is put into operation. Therefore, the signal input to the external microphone jack 8 is
It is applied to the magnetic head 7 through the path of switch S _1-1 - amplifier 1 and recorded on the magnetic tape, and is also applied to switch S _2-1 - amplifier 2 - variable resistor 9.
- also applied to the speaker 10 via the amplifier 3;
Monitoring becomes possible.

(ニ) 内蔵マイクロフオン入力信号を録音する場合スイツチＳ_1-1，Ｓ_1-2，Ｓ_1-3を録音側Ｒに、
スイツチＳ_2-1，Ｓ_2-2をテープ側Taに、内蔵マ
イクロフオン切換えスイツチS₃をオン側
（ON）に夫々転接すれば、内蔵マイクロフオン
回路５にはスイツチＳ_2-2のテープ側Ta接点−
スイツチＳ_1-3の録音側Ｒ接点−スイツチS₃の
オン側（ON）接点を介して＋Ｂ電源が印加さ
れてこの回路５は作動状態となり、回路５の出
力はスイツチＳ_1-1−増幅器１の経路にて磁気
ヘツド７に印加され、磁気テープに録音され
る。この際、増幅器２には＋Ｂ電源は印加され
ず、入力信号がモニターされることはないの
で、ハウリングを防止できる。(d) When recording the built-in microphone input signal, set switches S _1-1 , S _1-2 , and S _1-3 to the recording side R.
If the switches S _2-1 and S _2-2 are connected to the tape side Ta and the built-in microphone selector switch S ₃ is connected to the on side (ON), the built-in microphone circuit 5 will be connected to the tape side of the switch S _2-2 . Ta contact
+B power is applied through the recording side R contact of switch _S1-3 and the on side (ON) contact of switch _S3 , and this circuit 5 is activated, and the output of circuit 5 is connected to the switch _S1-1 - amplifier. The signal is applied to the magnetic head 7 through a path 1 and recorded on a magnetic tape. At this time, the +B power is not applied to the amplifier 2 and the input signal is not monitored, so howling can be prevented.

尚、(イ)テープ再生の場合及び(ハ)外部マイクロフ
オン入力信号を録音する場合に於いては、逆方向
に挿入されたダイオードＤによりチユーナー回路
６に＋Ｂ電源が印加されることはない。 In addition, in the case of (a) tape playback and (c) recording of an external microphone input signal, +B power is not applied to the tuner circuit 6 due to the diode D inserted in the opposite direction.

以上述べた如く本考案は、モニターのオン・オ
フを増幅器に対して駆動電源を印加するか否かに
より制御する構成としたものであり、録音再生切
換えスイツチを従来の４回路スイツチから３回路
スイツチに、また内蔵マイクロフオン切換えスイ
ツチを従来の２回路スイツチから１回路スイツチ
にすることができ、構成が簡単化されたものであ
る。更にステレオ装置に適用する場合には他のチ
ヤンネルの増幅器に対する＋Ｂ電源を第２図点
より得る様構成すれば良く、別途スイツチを設け
る必要もない。 As described above, the present invention has a configuration in which the on/off of the monitor is controlled by whether or not driving power is applied to the amplifier, and the recording/playback selector switch is changed from the conventional 4-circuit switch to a 3-circuit switch. Furthermore, the built-in microphone changeover switch can be changed from the conventional two-circuit switch to a one-circuit switch, simplifying the configuration. Furthermore, when the present invention is applied to a stereo device, the +B power supply for the amplifiers of other channels can be obtained from the point in Figure 2, and there is no need to provide a separate switch.

[Brief explanation of drawings]

第１図は従来のラジオ付テープレコーダの回路
図、第２図は本考案に係るラジオ付テープレコー
ダの駆動電源切換え回路図である。２は増幅器、５は内蔵マイクロフオン回路、６
はチユーナー回路、８は外部マイクロフオンジヤ
ツク、Ｓ_1-1，Ｓ_1-2，Ｓ_1-3は録音−再生切換えス
イツチ、Ｓ_2-1，Ｓ_2-2はラジオ−テープ切換えス
イツチ、S₃は内蔵マイクロフオン切換えスイツ
チ。 FIG. 1 is a circuit diagram of a conventional tape recorder with a radio, and FIG. 2 is a circuit diagram of a driving power source switching circuit of the tape recorder with a radio according to the present invention. 2 is an amplifier, 5 is a built-in microphone circuit, 6
is a tuner circuit, 8 is an external microphone jack, S _1-1 , S _1-2 , S _1-3 are recording-playback switching switches, S _2-1 , S _2-2 are radio-tape switching switches, S ₃ is a built-in microphone selector switch.

Claims

[Claim for Utility Model Registration] A first switch having three circuits for switching recording and playback, a second switch having two circuits for switching radio tapes, and a third switch having one circuit for switching built-in microphones. , a signal amplifier, and
It has a tuner circuit and a built-in microphone circuit, and when the second switch is connected to the radio side contact, the second switch of the second switch on the radio side
Applying power to the tuner circuit and the signal amplifier through circuit contacts, and guiding the output of the tuner circuit to the signal amplifier through a first circuit contact of the second switch on the radio side for radio reception. On the other hand, when the second switch is switched to the tape side contact, when the first switch is switched to the playback side contact, the second circuit contact of the second switch on the tape side and the playback side contact are switched. power is applied to the signal amplifier through the third circuit contact of the first switch on the side, and the reproduction output of the magnetic head in the reproduction state by the first and second circuit contacts of the first switch on the reproduction side. is guided to the signal amplifier through the first circuit contact of the second switch on the tape side for tape playback, and when the first switch is switched to the recording side contact, the first circuit on the recording side The first and second circuit contacts of the switch apply a signal from the built-in microphone or an external input signal to the magnetic head in the recording state to perform recording, and when the third switch is in the OFF contact, the magnetic head on the tape side 2nd switch of 2 switches
Applying power to the signal amplifier through the circuit contacts, the third circuit contact of the first switch on the recording side, and the third switch on the off side, and cutting off the power supply to the built-in microphone circuit, and turning off the tape. A driving power supply switching circuit for a tape recorder with a radio, characterized in that the circuit is configured to perform recording monitoring of an external input signal input to the signal amplifier through a first circuit contact of the second switch located on the side.