JPH0248982Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tape recorder, which delays a running state signal generated from a muting signal and a pause signal by the time necessary for running the leader tape.
By extracting the tape end detection signal only when this running status signal is generated, it is possible to prevent malfunctions that occur when running a completely rewound tape, thereby providing a tape recorder that does not require a microcomputer for this control. The purpose is to

Conventionally, the difference in light transmittance or reflectance between a magnetic tape and the leader tapes provided at both ends of the magnetic tape has been used to detect changes in the light transmittance (or reflectance). There is a tape recorder that reverses the running direction of the tape or stops running the tape at the end of the magnetic tape. In such a tape recorder, when a completely rewound magnetic tape is loaded and the tape starts running,
First, the leader tape takes the lead, and the magnetic tape runs right after it, and the amount of light transmitted (or reflected) by these tapes changes, so that the tape running is reversed or stopped. For this reason, even if a change in the amount of light transmitted (or reflected) from the tape is detected for 10 seconds after the tape has started running and the leader tape has run for 10 seconds, reversing the tape running or generating a stop signal is prohibited. In conventional tape recorders, the generation control of these reflections and stop signals is performed by a microcomputer, and a tape recorder not equipped with a microcomputer has the disadvantage that the above-mentioned control cannot be performed.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

The figure shows a block system diagram of an embodiment of the tape recorder according to the present invention. In the figure, reference numeral 1 is an operation panel, which has a record button, a playback button, a fast forward button, a rewind button, a pause button, a stop button, etc. It generates mode signals according to the operation of these buttons and controls the control circuit. Supply to 2. The control circuit 2 generates control signals such as a mechanism control signal, a muting signal, a temporary stop signal, and a switching signal corresponding to the mode signal. This mechanism control signal is supplied to the drive mechanism 3, which drives drive mechanisms such as a reel motor, a capstan motor, and a plunger to perform a predetermined operation. The switching signal is supplied to the recording/reproducing amplifier 4 and the oscillator 5,
When this switching signal instructs the recording mode, the oscillator 5 generates a bias signal and supplies it to the amplifier 4 and erase head 6, and the amplifier 4 amplifies the audio signal supplied from the input terminal 7 and superimposes it on the bias signal. The audio signal is recorded on the magnetic tape section of the tape 9 which is supplied to the post-recording/reproducing head 8 and runs in the direction of arrow A. Furthermore, when the switching signal instructs the reproduction mode, the oscillator 5 does not oscillate, and the signal reproduced by the recording/reproducing head 8 is amplified by the recording/reproducing amplifier 4 and then passed through the muting circuit 10 to the output terminal 11. It is output from The muting circuit 10 attenuates the reproduced audio signal from the amplifier 4 when a muting signal of, for example, HL level is supplied from the control circuit 2.

The control circuit 2 generates an H-level muting signal in fast forward mode, rewind mode, stop mode, playback and pause mode, and generates a muting signal at H level in record mode,
In the reproduction mode, recording and pause mode, no muting signal is generated, and the generated muting signal is supplied to the logic circuit 12 in addition to the above-mentioned muting circuit 10. Further, in the temporary stop mode, an H level temporary stop signal generated by the control circuit 2 is supplied to the logic circuit 12. The logic circuit 12 takes the logical sum of the mutating signal and the pause signal, and outputs a running state signal of L level when the tape is running in the recording mode and the playback mode. This running state signal is supplied to a delay circuit 13, where it is delayed by about 10 seconds, for example, and then supplied to a gate circuit 14.

Further, for example, a reflective type photocoupler 15 is provided on the tape running path, and this photocoupler 15 generates a voltage signal corresponding to the amount of light reflected from the tape 9 and supplies it to the tape end detection circuit 16. The tape end detection circuit 16 generates a pulse when it detects a voltage change in the signal caused by the difference in the amount of reflected light between the leader tape and the magnetic tape, and supplies this pulse to the gate circuit 14 as a tape end detection signal. The gate circuit 14 passes the tape end detection signal and supplies it to the control circuit only when the L level running state signal is supplied from the delay circuit 13, and the control circuit 2 starts tape running when the tape end detection signal is received. A mechanism control signal for reversing or stopping the tape is generated and supplied to the drive mechanism 3, thereby reversing or stopping the tape running.

Here, when the recording button is operated from the stop mode in which a completely rewound tape, such as a new tape, is loaded, the recording mode is set, the control circuit 2 stops generating the mutating signal, and the logic circuit 12 starts running. Generates a status signal. Since this signal is delayed, the running state signal at L level is supplied to the gate circuit 14 approximately 10 seconds after the recording mode is entered. Tape running starts as soon as the recording mode is entered, and within 10 seconds the leader tape stops running and the magnetic tape starts running. At this time, a tape end detection signal is output from the tape end detection circuit 16, but since the control terminal of the gate circuit 14 is still at H level, the tape end detection signal is not supplied to the control circuit 2. Therefore, the tape 9 continues to run, and recording is performed on the outward track. Thereafter, when the magnetic tape stops running and the leader tape starts running, a tape end detection signal is supplied to the gate circuit 14. At this point, since the delay circuit 13 is supplying an L-level running state signal, the tape end detection signal is supplied to the control circuit 2 via the gate 14. As a result, the control circuit 2 generates a mechanism control signal to operate the drive mechanism, reverse the tape running direction, move the positions of the heads 6 and 8, and perform recording on the return track.

Here, even if the tape end is detected during the fast forward mode or the rewind mode, no tape end detection signal is supplied to the control circuit 2. However, when the tape 9 including the leader tape finishes running due to fast forwarding or rewinding, the reel stand (not shown) that rotates the tape reel stops rotating, and the reel stand stops rotating. It is detected by a detection circuit (not shown), and this rotation stop detection signal is supplied from the input terminal 17 to the control circuit 2 to forcibly set the stop mode.

By the way, it is common for most tape recorders to perform muting by generating muting when in fast forward mode, rewind mode, stop mode, playback and pause mode, and mutating when in pause mode. Since signals are naturally generated, control using a muting signal and a pause signal as in the above embodiment can be applied to any tape recorder.

As mentioned above, the tape recorder according to the present invention has a tape end detection circuit that detects the joint between the magnetic tape and the leader tape, and receives a detection signal from the tape end detection circuit to reverse the tape running direction or stop the tape running. In a tape recorder that performs tape running in recording mode and playback mode, based on the muting signal generated in fast forward mode, rewind mode, stop mode, playback and pause mode, and the pause signal generated in pause mode. a logic circuit that generates a running status signal indicating that the leader tape is running; a delay circuit that delays the running status signal by at least the time necessary for the leader tape to run; and a tape end detection circuit that detects the tape end only when the status signal is supplied from the delay circuit. It consists of a gate circuit that takes out the detection signal from the circuit and reverses the tape running direction or stops the tape running, so the tape end cannot be detected until the time necessary for the leader tape to run after starting tape running. When the completely rewound tape starts running without taking out the signal and the leader tape runs to the magnetic tape, it is possible to prevent malfunctions such as reversal of the tape running direction, and a microcomputer is used to control these operations. It has the advantage that it does not require

[Brief explanation of the drawing]

The figure is a block system diagram of an embodiment of the tape recorder according to the present invention. DESCRIPTION OF SYMBOLS 1... Operation panel, 2... Control circuit, 3... Drive mechanism, 4... Recording/playback amplifier, 8... Recording/playback head, 9... Tape, 10... Muting circuit, 12... Logic circuit , 13...delay circuit, 1
4...Gate circuit, 15...Photocoupler, 16
...Tape end detection circuit.

Claims (1)

[Scope of utility model registration request] In a tape recorder that has a tape end detection circuit that detects a joint between a magnetic tape and a leader tape, and that reverses the tape running direction or stops tape running based on the detection signal of the tape end detection circuit, it is possible to set fast forward mode and winding. A running state signal indicating that the tape is running in the recording mode and playback mode based on the muting signal generated in the return mode, stop mode, playback and pause mode, and the pause signal generated in the pause mode. a logic circuit that generates the running status signal, a delay circuit that delays the running status signal by at least the time necessary for running the leader tape, and a detection signal from the tape end detection circuit only when the status signal is supplied from the delay circuit. A tape recorder comprising a gate circuit that takes out the tape and reverses the tape running direction or stops the tape running.