JPS6185629A - Double cassette tape recorder - Google Patents

Abstract

PURPOSE:To improve the operability of recording, reproducing, and dubbing by providing the first and the second cassette decks and common regenerative amplifier and recording amplifier and detecting the setting of a cassette to each deck to control the connection of recording and reproducing heads. CONSTITUTION:Not only the first and the second cassette deck but also the common regenerative amplifier 14 and the recording amplifier 16 are provided. A detecting means 19 is provided with a detecting switch 20 which is closed when a cassette is set to the first deck and a switch 21 which is closed when a cassette is set to the second deck and switch controllers 24 and 25 control the switching of switch elements 26 and 27 in response to a control voltage having three various levels from the means 19 to set not only a recording and reproducing head 12 or 13 in the deck, to which the cassette is set, to the operation state for recording or reproducing but also said head 12 or 13 in the other deck to the unoperated state and both decks are set to the dubbing state automatically when cassettes are set to both decks. Thus, the operability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a double cassette tape recorder that is equipped with first and second cassette decks and also equipped with a common reproduction amplifier and recording amplifier.

(B) Conventional Technology As shown in Fig. 6, this type of double cassette tape recorder has a first cassette deck with a playback head +1 for playback only and a playback amplifier (21ft), and a recording/playback rack for recording and playback (1). 3) and playback amplifier (4)
, a second cassette deck equipped with a recording amplifier (5).

In such a conventional circuit, the recording/playback selector switch T61 (
71 is switched to the playback side terminal (P), and the cassette deck selection switch (8) is switched to the first cassette deck side terminal (Dl), from the playback head (1) of the first cassette deck. The signal is amplified by a reproduction amplifier (2), outputted to an output terminal (9), and reproduced by a speaker (not shown). Then, set the cassette deck selection switch (8) to the second cassette deck side terminal (D
1), the signal from the recording/playback head (3) of the second cassette deck is amplified by the playback amplifier (4) and output to the output terminal (9).

In addition, the bell sound playback switch f61 (71 is the recording side terminal (
In the recording mode switched to R1, if the cassette deck selection switch (8) is switched to the first cassette deck side terminal (Dl), the playback head +I+ of the first cassette deck
The signal from is amplified by the reproduction amplifier (21) and sent to the output terminal (
9) and simultaneously output to the second recording amplifier (51).
The information is recorded on tape by the recording/playback head (3) of the cassette deck. That is, it is dubbed. Also, when the cassette deck selection switch (8) is switched to the second cassette deck side terminal (Dl), the external input signal from the input terminal tll is amplified by the preamplifier (Ill) and sent to the second cassette deck side terminal via the recording amplifier (5). The recording and playback head of the cassette deck (
31, it is recorded on tape.

The conventional dubbing tape recorder described above requires a playback amplifier +21 (41) on each of the first cassette deck side and the second cassette deck side, and in order to add a recording function to the first cassette deck side pressure, it is necessary to switch between the recording amplifier and the recording/playback switch. It requires a switch.

To solve this problem, Japanese Patent Application Laid-Open No. 50-9
Japanese Patent No. 9302 describes a dubbing tape recorder in which a common reproduction amplifier and recording amplifier are provided for a first cassette deck and a second cassette deck.

(c) Problems to be solved by the invention In the conventional circuit shown in FIG. 6 and the one shown in Japanese Patent Application Laid-Open No. 50-99302, the signal path is separated by a recording/playback switch connected within the signal path. Otherwise, the printed circuit board design becomes very complicated, and the playback (recording) of the first cassette deck is difficult regardless of the presence or absence of a cassette attached to the first cassette deck and/or the #I2 cassette deck. There is a problem in that the selection of the mode, the recording/playback mode of the second cassette deck, and the dubbing mode must all be done by the user's switch operation, making the operation complicated.

B.) Means for Solving the Problems Ninthly, the present invention solves the above problems.
A double cassette tape recorder comprising a cassette deck and a common playback amplifier and recording amplifier, the double cassette tape recorder comprising a detection means for detecting the attachment of a cassette to each of the cassette decks; When a cassette is installed, the dominant playback head on the cassette deck side is set to an operating state for recording or playback, and at the same time the recording/playback head on the other cassette deck is set to an inactive state, and the detection means When a cassette is inserted into each of the cassette decks, the recording/playback head on one cassette deck is automatically connected to the playback amplifier, and the recording/playback head on the other cassette deck is connected to the recording number to set it to dubbing mode. The present invention provides a double cassette tape recorder characterized by the following configuration.

(e) Operation In the double cassette tape recorder of the present invention, which has the above means, when a cassette is mounted on the first cassette deck, the recording or playback mode of the cassette is automatically obtained, and the cassette is placed on the second cassette deck. If you attach the cassette, you will automatically be able to record or play that cassette.
Furthermore, if a cassette is installed in each of the first and second cassette decks, a dubbing mode can be automatically obtained in which the first cassette deck is set to the playback mode and the second cassette deck is set to the recording mode.

(F) Embodiment The circuit configuration diagram of the double cassette tape recorder of the present invention shown in the drawings will be explained below.

(F6 is the recording/playback head of the first cassette deck, hereinafter referred to as the first recording/playback head for the purpose of explanation. (13 is the recording/playback head of the second cassette deck, hereinafter referred to as the second recording/playback head for the purpose of explanation.

04 is a playback amplifier whose input side is connected to one end of the first recording/playback head α2 and whose output side is connected to the output terminal α9;
The head is a recording amplifier connected to one end of the second recording/reproducing head α3 on the output side, and the input side is connected to the preamplifier a71f and the input terminal ladder.8One of the features of the circuit configuration of the present invention. First, the other end of the first recording/playback head 0z is connected to the other end of the second recording/playback head (13), and the output side of the playback amplifier (2) and the input side of the recording amplifier (tie) are connected to form a closed loop. This is the point.

+In is a detection means for detecting the attachment of a cassette to the first and second cassette decks, and the detection means (19 is a first cassette detection switch (1) that closes when a cassette is attached to the first cassette deck; The second cassette detection switch QB, which closes at 9 o'clock when a cassette is attached, is composed of a resistor l2z (231) of the same value, and the first cassette detection switch QB has one end grounded and a resistor connected to the other end. A control voltage (10 B) is applied to one end of the second cassette detection switch Qυ, and a resistor 12.1 is connected to the other end. It is configured to output control voltages of different levels.

That is, the control voltage from the detection means (1'J) is applied when both the first and second cassette detection switches ■C1!D are open,
Or it is low when only m1 cassette detection switch (2) is closed (Ll level, second cassette detection switch Q1)
When only the first and second cassette detection switches (21) are closed, the circle level is high, and when both the first and second cassette detection switches (21) are closed, the level is intermediate between H and H.

C,! 4J are first and second switch controllers responsive to five different levels of control voltage from the detection means (19), the first switch controller c! The two-switch controller G controls the second switch @.

The first switch element ■ has three switching terminals +II (Il
The second switch element surface also includes six switching terminals (1) (IIll [I). The common terminal of the first switch element (C1 is
and H42 recording/playback head (connected to the connection midpoint of 13,
In addition, the common terminal (01) on the forehead of the second switch element is grounded, and the first switching terminal (II (1) of each switch element (to) @
), the second switching terminal (Ill(II)), and the fifth switching terminal (fill(1)) are connected.

The first switching terminal (1) (II) is connected to the connection midpoint between the second recording/playback head a3 and the recording amplifier (161), and the second switching terminal (1) (■) is connected to the first rut sound playback head (12 It is connected to the connection midpoint of playback amplifier I.

2J1) The switch controller c141 switches the first switch element 2 into the first switching terminal when the control voltage from the detection means 09 is at the L level, and sets the first switch element into the first switching terminal when the control voltage from the detection means 09 is at the H level.
Switch element ■ is connected to the second switching terminal (H1, the control voltage is M
+/First switch element when bevel ■t- Third switching terminal (
When the control voltage is at the M level, the d42 switch controller 4 functions to switch the second switch element αn to the fifth switching terminal (main).

c! A is a human-powered controller that detects the presence or absence of the external input (No. 1) from the input terminal (181. When there is no input signal, it is low (Ll level), and when there is a human-powered signal, it outputs a high billion lvl, and the input No. 48 is interrupted, etc. Considering this, a slight time constant is given for switching from H level to L level.Q3
is a fifth switch controller that controls the second switch element @ in response to the output level from the input controller (to); ).

In addition, the switching function of the second switch element penalty by the M level input of the m2 switch controller is the 3rd X (ff
This function has priority over the functions provided by the L level and H level inputs of the controller (to).

The present invention is configured as described above, and its operation will be described below.

■ Playback mode when the cassette is installed only in the first cassette deck At this time, the first switch controller @ switches the first switch terminal ■ to the first switching terminal (1) by the L level output from the detection means σ9. Also, since no external input signal is applied to the input terminal U, the L from the input controller is
# by level output! 5 switch controller c! 9
The second switch element @ is switched to the first switching terminal (IIK (see Fig. 1)).

Therefore, the other end of the first sickle sound reproducing head a21 and the output side of the recording amplifier ae are grounded, and both ends of the second recording and reproducing head a21 are short-circuited.

However, when a tape running operation for playback operation is performed in this state, the signal from the first recording/playback head (12+) is amplified by the playback amplifier (141), outputted to the output terminal 09, and played back by the speaker. A part of the reproduction signal is also input to the recording amplifier (Iθ), but since the output side of the recording amplifier is grounded, it is not applied to the second recording/reproducing head.

(δ Recording mode when a cassette is installed only on the first cassette deck
1 switching terminal (1) and an external input signal is applied to the input terminal αg, the input controller 28
) of the third switch controller switches the second switch element @ to the second switching terminal (Ill) (see FIG. 2).

Therefore, the other end of the first recording/playback head fi3 is connected to the output side pressure of the recording amplifier (e), and one end of the head and the input side of the playback amplifier (141) are grounded, while the second
Both ends of the recording/playback head (13) are short-circuited.

However, when running the tape for recording in this state, the external input signal from the input terminal (IID) is amplified by the preamplifier (17) and then guided to the output terminal α9 for monitoring. Recording amplifier (1st after 1e)
The signal is supplied to the recording/playback head (121) and recorded on the cassette of the first cassette deck.

■ Playback mode when a cassette is installed only on the second cassette deck At this time, the first switch controller (2) switches the first switch element (■) to the second switching terminal l1)1 by the H level output from the detection means a9, and Since no external input signal is applied to the input terminal (1 second), the third switch controller (■) switches the second switch element @ to the first switching terminal (
(See Figure 5).

Therefore, the other end of the second sickle playback head (131 is connected to the input side of the playback amplifier I via the first switch element (261), and one end of the head and the output side of the recording amplifier (161) are connected to the second switch element (161). Both ends of the recording/reproducing head az are short-circuited via the first switch element (5).

However, when the tape is run for playback in this state, the signal from the second recording/playback head (13) is amplified by the playback amplifier (141) and can be played back from the output terminal to the speaker. Recording mode when the cassette is installed only in the cassette deck At this time, as mentioned above, the first switch element @ is switched to the second switching terminal (Ill), and since the external input signal is applied to the input terminal agJ, the input controller In response to the H level input from (1), the fifth switch controller is switched to the second switch element 121t-second switching terminal (II) (see FIG. 4).

Therefore, the other end of the second recording/playback head (131) and the input side of the playback amplifier (141) are connected to the first and m2 switch elements □□□
The head is grounded through the forehead, and both ends of the first recording/reproducing head (121) are short-circuited.

However, when running the tape for recording in this state, the external input signal from the input terminal 0 seconds is amplified by the preamplifier αη and then guided to the output terminal a51 for monitoring, and at the same time the recording starts. 8f after amplifier ae'! The data is supplied to the second recording/playback head U and recorded on the cassette of the second cassette deck.

■ Dubbing mode when cassettes are installed on both the first cassette deck and the second cassette deck At this time, the M level output from the detection means u9 causes the first switch/troller (2) to switch the first switch element to the third switching terminal ( [Switch to 1, and also switch to the 2nd switch roller (
) switches the second switch element CD to the third switching terminal ([1 (see FIG. 5)).

Therefore, in this case, the other ends of the first sound reproduction head 2 and the second recording and reproduction head (131) are grounded via the first and second switch elements (2) (271).

However, when running the tape for dubbing in this state, the signal from the first recording/playback head (12+) is amplified by the playback amplifier (14+) and then sent to the output terminal (151).
At the same time, it is supplied to the second sound reproduction head (131) via the recording amplifier α.

As a result, the cassette in the first cassette deck is played back and recorded on the cassette in the second cassette deck.

In other words, dubbing is possible. (g) Effect of the invention Since the present invention is constructed as described above,
It is only necessary to prepare one system of playback amplifier and recording amplifier for each recording/playback head of J and FL cassette decks, and signals for selective recording, playback mode switching, and dubbing mode switching of each cassette deck are required. Since it is not a changeover switch system that separates or connects paths, there is no problem of oscillation or leakage occurring due to electrical coupling due to the close proximity of signal input and output in the changeover switch section.

In particular, according to the present invention, if a cassette is installed only in the first cassette deck, if a recording head is installed on the first cassette deck, the recording/playback head on the cassette deck is automatically brought into the operating state for recording or playback mode. If you set the cassettes to both cassette decks,
Since the reproduction signal of the cassette on the cassette deck side can be recorded on the cassette on the second cassette deck side, that is, the dubbing mode can be automatically set, the operability is greatly improved and this is useful.

[Brief explanation of the drawing]

1 to 5 are circuit configuration diagrams showing different operation modes of the double cassette tape recorder of the present invention, and FIG. 6 is a conventional circuit configuration diagram. az... Recording/playback head of the first cassette deck, (1
3-- Recording/playback head of the second cassette deck. (14)-M student 77b, 161 ・i sound 77p, (
19.-detection means, (2) (to)■...first, second
and a fifth switch roller, ■■η...first and s2 switch elements.

Claims (1)

[Claims] (1) A double cassette tape recorder comprising first and second cassette decks and a common playback amplifier and recording amplifier, comprising a detection means for detecting the attachment of a cassette to each of the cassette decks, the detection means When a cassette is installed in one of the cassette decks, the recording/playback head on the cassette deck is set to an operating state for recording or playback, and at the same time, the recording/playback head on the other cassette deck is set to an inactive state. Furthermore, when a cassette is installed in both cassette decks, the detection means automatically connects the recording/playback head of one cassette deck to the playback amplifier, and connects the recording/playback head of the other cassette deck to the recording amplifier. A double cassette tape recorder characterized in that it is configured to be connected and set to a dubbing state.