JPS6117555Y2 - - Google Patents

Description

[Detailed description of the invention] The invention is an operation circuit that outputs signals for performing various operations in response to signals input by operating operation buttons for recording, playback, fast forward, rewind, pause, and stop. The present invention relates to a tape recorder having a tape recorder.

High-grade tape recorders called tape decks are generally constructed so that each operation is switched by the suction operation of a plunger. Recently, there have been many operation circuits implemented as ICs (integrated circuits) as operation circuits for controlling the operation of such plungers. This invention is based on such an IC.
This invention aims to provide a control circuit for a tape recorder using a standardized operation circuit, and will be described in detail below with reference to the drawings.

The illustrated circuit is one embodiment of the control circuit of the present invention. In the figure, 1 is an IC operation circuit, which includes at least a power supply terminal 2, a ground terminal 3,
It includes a playback input terminal 4, a pause input terminal 5, a stop input terminal 6, a playback output terminal 7, a pause output terminal 8, and an operation signal output terminal 9.
10, 11 and 12 are playback input terminals 4,
A reproduction operation switch, a pause operation switch, and a stop operation switch are connected between the pause input terminal 5 and the stop input terminal 6 and the ground, and each of them is a non-lock type switch. When the playback operation switch 10 is closed, an H (high) level signal is output to the playback output terminal 7, and the pause operation switch 11 is outputted to the playback output terminal 7.
When closed, an L (low) level signal is output. Further, an H level signal and an L level signal are repeatedly outputted to the temporary stop output terminal 8 each time the temporary stop operation switch 11 is closed, and the operation signal output terminal 9 is repeatedly outputted from other signals of the operation circuit 1. When an H level signal is output to the output terminal, an H level signal is output. Reference numeral 13 denotes a first plunger driven by a transistor 14 which becomes conductive when an H level signal is output from the reproduction output terminal 7 of the operating circuit 1, and the magnetic head is fixed by its suction operation. It has the effect of displacing the sliding substrate to an operating position where the magnetic head contacts the magnetic tape.

A second plunger 15 is driven by a transistor 16 that becomes conductive when an H-level signal is output from the reproduction output terminal 7, and its suction action presses the pinch roller against the capstan and causes the reel to move. It has the effect of activating the drive mechanism that transmits rotation to the shaft.
Reference numeral 17 denotes a flip-flop circuit constituted by NAND circuits 18 and 19, which is reset when the signal at the operation signal output terminal 9 of the operation circuit 1 goes to L level and when the playback operation switch 10 is closed. It performs an inverting operation and outputs an H level signal to the output terminal 20. 21 is a NAND circuit that receives signals from the temporary stop output terminal 8 of the operating circuit 1 and the output terminal 20 of the flip-flop circuit 17; 22 is an inverter that inverts the output of the NAND circuit 21; 23 through the transistor 1
It is connected so that it is applied to the base of 4.
Further, 24 is a diode for preventing backflow. The present invention is constructed as described above, and its operation will be explained next.

When a power switch (not shown) is turned on, power is supplied to the power line 25 and the operation circuit 1 becomes operational. When the operation switch is not operated, the outputs of the playback output terminal 7, the pause output terminal 8, and the operation signal output terminal 9 are all at the L level, and as a result, the flip-flop circuit 17 is reset and its output is at the L level. In such a state, when the playback operation switch 10 is closed, an H level signal is output to the playback output terminal 7 of the operation circuit 1, and the flip-flop circuit 17 is inverted and an H level signal is output from the output terminal 20. is output. As a result, the transistors 14 and 16 to which the signal from the reproducing output terminal 7 is applied are reversed to conductive states, causing the first plunger 13 and the second plunger 15 to perform a suction operation, respectively. The sliding substrate is displaced to the operating position by the suction action of the first plunger 13, the pinch roller is pressed against the capstan by the suction action of the second plunger 15, and the drive mechanism that transmits rotation to the reel shaft is activated. The operating state is entered and the playback state of the tape recorder is configured. In such a playback state, when a pause operation is performed, the pause switch 11 is closed and a signal is input to the operating circuit 1, and as a result, an H level signal is output to the pause output terminal 8, and the H level signal is outputted to the pause output terminal 8. The signal at the reproduction output terminal 7, which had been outputting the signal, becomes L level. When an H level signal is output to the temporary stop output terminal 8, the output of the NAND circuit 21 becomes L level, and the output of the inverter 22 to which the L level signal is input becomes H level. Therefore, even when the output of the reproduction output terminal 7 is at L level, the H level signal from the inverter 22 is applied to the base of the transistor 14, and the transistor 1
4 is kept in a conductive state to keep the first plunger 13 in a suction state. When the temporary stop operation is performed in this manner, the first plunger 13 is in the suction operation state and holds the sliding substrate in the operation position, but the second plunger 15 is returned to the non-suction operation state, so that the pinch roller is separated from the capstan and the pinch roller is separated from the capstan. The drive mechanism becomes inactive and the tape recorder becomes paused. In this state, when the temporary stop operation switch 11 is closed again, the signal at the playback output terminal 7 becomes H level, and the signal at the temporary stop output terminal 8 becomes L level, and the playback operation is started. In such a reproducing state, when the stop operation switch 12 is closed, the reproducing output terminal 7 and the operation signal output terminal 9 are closed.
Both signals become L level. As a result, the tape recorder is stopped and the flip-flop circuit 17 is reset, so that the output signal at its output terminal 20 becomes L level.

As described above, the pause operation is performed in the playback operation state, but the pause operation in the recording operation state can also be performed in the same way. That is, the recording operation is performed by closing the recording operation switch (not shown) and the playback operation switch 10, and the drive mechanism is controlled by the output signal of the playback output terminal 7, so the operation is the same as during playback. A temporary stop operation is performed by the operation.

In this embodiment, when a pause operation is performed, the output of the reproduction output terminal 7 becomes L level, and the output of the inverter 22 becomes H level, and the transistor 14 momentarily becomes non-conductive, but the first plunger 13 The non-conducting time is much shorter than the return operation, so there is no problem. However, if necessary, a delay circuit may be provided in the base circuit of the transistor 14. Furthermore, in the operating circuit 1 in this embodiment, a case has been described in which a control signal is input by grounding the input terminal by closing each operating switch. It is possible to use an operating circuit adapted to input as .

As explained above, the control circuit of the present invention displaces and maintains the sliding substrate in the first and second plungers in the operating position, which is controlled by the signal output from the reproduction output terminal of the operating circuit. The plunger maintains the plunger in an operating state by a logical output between the signal obtained from the output terminal for pause and the output signal of the flip-flop circuit which is reversed by the regeneration operation, and puts the drive mechanism such as the pinch roller into the operating state. It is possible to return to the non-operating state by inverting the L level of the output signal of the reproduction output terminal, and it is possible to easily configure a temporary stop state without returning the sliding board to the non-operating position. .

[Brief explanation of the drawing]

The illustrated circuit is one embodiment of the control circuit of the present invention. Explanation of main drawing numbers, 1... Operating circuit, 7... Output terminal for playback, 8... Output terminal for pause, 9...
Operation signal output terminal, 10... Operation switch for playback, 11... Operation switch for pause, 12...
Stop operation switch, 13...first plunger, 15...second plunger, 17...flip-flop circuit.

Claims (1)

[Scope of utility model registration request] A playback output terminal outputs an H level signal when the playback operation switch is closed, and an L level signal is output when the pause operation switch is closed, and an H level signal is output when the pause operation switch is closed. In the tape recorder, the playback output includes an operation circuit having a pause output terminal that outputs a level signal and an operation signal output terminal that outputs an H level signal when the tape recorder is in a state other than stop. When an H level signal is output from the terminal, a first plunger operates to attract and displace the sliding board to which the magnetic head is fixed to an operating position, and when an H level signal is output from the reproduction output terminal. a second plunger that performs a suction operation to put a constant speed drive mechanism such as a pinch roller into operation, and a flip-flop circuit that is reset by an L level signal from the operation signal output terminal and reversed by closing the regeneration operation switch. and a logic circuit which receives the output signal of the flip-flop circuit and the signal from the pause output terminal, and receives an H signal from the reproduction output terminal.
When a pause operation is performed in a playback operation state where a level signal is output, the output signal of the logic circuit causes only the first plunger to be held in a suction operation state and the tape recorder to be put in a pause state. Control circuit for a tape recorder.