KR820002166Y1 - Recording and/or reproducing apparatus - Google Patents

Abstract

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Description

Record and playback device

1 is a circuit diagram of a tape recorder showing an embodiment of the present invention.

2 is a circuit diagram of the main part of FIG.

* Explanation of symbols for main parts of the drawings

10: alarm signal generating circuit 14a: recording command signal input terminal

14b: recording release signal input terminal 15: incorrect operation prevention circuit

C ₁ R ₅ : Integrating circuit S ₇ : Power switch

Sa: Recordable changeover switch

The present invention relates to a recording and reproducing apparatus which can prevent misoperation.

In the case of a cassette type tape recorder, as is well known, when the cassette has been recorded, when the cassette is mounted on the tape recorder with the click provided at the rear of the cassette folded, the presence or absence of the click is detected. If not, the tape recorder will be incapable of recording, preventing the magnetic tape from being erased.

Especially in the tape recorder that allows remote control, the user does not know that such recording is not possible or the cassette is not installed, and the recording is performed by pressing the recording button of the remote control device. I may just think of it as it is. In many cases, recording of a commercial tape recorder cannot be done again, and it is very important to prevent such misoperation.

The present invention solves the above problem, and includes a first holding switch having a self-holding circuit, connected to a power supply, and turned on by a recording operation, and recording is impossible by recording. A second switch connected to the power supply via the first switch, and an alarm signal generating circuit and the self-holding circuit supplied with the power by turning on the third switch. There is provided a recording and reproducing apparatus having three switches, wherein the third switch is turned on for a predetermined time after the power is turned on, and the magnetic holding circuit is operated for a predetermined time.

As a result, when the record button is pressed while the tape recorder is not recording, it is possible to generate an alarm and return the circuit to the reproducing state automatically exchanged after a predetermined time.

Next, embodiments of the present invention will be described with reference to the drawings.

The figure is a circuit diagram of a cassette type tape recorder including a misoperation prevention circuit. In the figure, reference numeral 1 denotes a recording / reproduction magnetic head, reference numeral 2 denotes a magnetic tape, reference numeral 3 a microphone terminal, reference numeral 4 a preamplifier, reference numeral 5 a recording / reproduction amplifier, ) Is an output amplifier, (7) is a speaker, (8) is an AGC circuit, (9) is a bias oscillator, (10) is an alarm signal generator circuit, (11) is an equalizer for playback, and (12) is an equalizer for recording. to be.

S ₁ is a switching switch between the microphone terminal 3 and the magnetic head 1, S ₂ is an advanced switching switch, S ₃ is a switching switch for connection and cutting of the equalizer 11, and S ₄ is an equalizer ( 19) connection and cutting switch, S ₅ is the switching and switching switch of the AGC circuit (8), S ₆ is the switching switch between the output amplifier (6) and the speaker (7), S ₇ , S ₈ is As a self-holding switching switch, S ₇ supplies a power supply B ₁ to be described later, and S ₈ supplies a power supply B ₂ to a relay circuit to be described later.

The switches S _{1 ...} S ₈ each have a contact REC for recording and a contact PB for playback.

13 is a power supply circuit, and two power supplies B ₁ and B ₂ are obtained. The power source B ₁ is supplied to the movable contacts of the preamplifier (4), the amplifier (5), the output amplifier (6), the AGC circuit (8) and the switch S ₇ , and the power source B ₂ is the alarm signal generating circuit (10) and the switch. S ₈ of the movable contact and the relay will be described later, which is supplied to the RY _1, RY _2.

The relay RY ₁ switches the front end portion of the amplification circuit mainly of the switches S ₁ , S ₂ , S _3, and S ₈ , and is driven by the transistor Q ₄ . The relay RY ₂ switches mainly the rear end portion of the amplifier circuits of the switches S ₄ , S ₅ , S _6, and S ₇ , and is driven by the transistor Q ₂ . These relays RY ₁ and RY ₂ are both energized when the transistors Q ₁ and Q ₂ are turned on. At this time, each switch S _{1 ...} S ₈ is closed on the contact REC side.

Next, 14a and 14b are remote control device connection terminals, and the recording command signal is applied to the base of the transistor Q ₂ through the resistor R ₁ at the terminal 14a to turn it on. The terminal 14b is connected to the base of the transistor Q ₃ . Therefore, when the recording signal is applied to this terminal 14b, the transistor Qa is turned on and the transistor Q ₁ is turned off.

In addition, the transistor at the same time, the power B ₂ in the REC contact of the switch S ₈ is supplied to the bias oscillator 9, a non-return (逆流防止) diode D ₁ and a resistor to the base of the transistor Q ₂ through R _1, via the resistance R ₂ It is applied to the base of Q ₁ , respectively.

Next, S ₉ is a switch which detects and switches the recording availability, and when there is a click on the rear of the cassette and closes to the contact REC side when recording is possible, recording is performed when there is no click of the cassette or when the cassette is not mounted. When it is impossible, it closes to the contact NON-REC side, and normally closes to a NON-REC side. The connection REC is connected to the base of the transistor Q _{1 through} the backflow prevention diode D ₃ and the resistor R ₃ .

15 is an erroneous operation prevention circuit is constituted by the transistor Q _4, the resistance _{R 4, R 5, R 6} , R 7 and capacitor C _1. The power supply B ₁ of this circuit 15 is supplied via the REC contact of switch S ₇ and the NON-REC junction of switch S ₉ .

This power supply B ₁ is also applied to the base of transistor Q ₂ through resistor R ₄ and backflow prevention diode D ₂ and again to the base of driving transistor Q ₅ of alarm signal generating circuit 10 via resistor R ₅ . have.

D ₄ and D ₅ are diodes for counter electromotive force discharge.

The operation by the above configuration will be described.

First, a case in which a cassette with a click is mounted will be described.

In this case, the switch S ₉ is closed to the contact REC side, and in the initial state, all the switches S _{1 ...} S ₈ are all closed to the contact PB side. Thus, when the recording command signal in the pulsed phase is applied to the terminal 14a by the remote control device, the transistor Q ₂ is turned on and the relay RY ₂ is energized to switch S ₄ , S ₅ , S ₆ and S _7. This is switched to the REC side.

As a result, the equalizer 12 is connected via the capacitors C ₂ and C ₃ , the AGC circuit 8 is operated, and the alarm signal generation circuit 10 is connected to the speaker 7.

In addition, since the switch S ₇ is switched to the REC side, the power source B ₁ is applied to the base of the transistor Q ₁ through the REC contact of the switch S ₉ , the diode D _3, and the resistor R ₃ to turn them on. Therefore, the relay RY ₁ is energized, and the switches S ₁ , S ₂ , S _3, and S ₈ are switched to the REC side. For this reason, the microphone terminal 3 is connected to the preamplifier 4, one end of the magnetic head 1 is adjoined, the equalizer 11 is cut off, and the resistor R ₉ is connected. The switch S ₆ is switched to the REC side, so that the power supply B ₂ is supplied to the bias oscillator 9 to operate it, while the power supply B ₂ is also connected to the base of the transistor Q ₁ through the diode D ₁ and the resistor R ₁ . Since transistors are applied to the base of transistor Q ₁ through R ₂ , these transistors Q ₁ and Q ₂ remain on, and relays RY ₁ and RY ₂ maintain their energized state.

By the above operation, the circuit is set in the recording state, and the normal recording operation can be performed. That is, the input signal from the microphone terminal 3 is supplied to the magnetic head 1 together with the bias signal from the bias oscillator 9 through the preamplifier 4, the amplifier 5, the equalizer 12, It is recorded on the tape 2. Then, the alarm signal generation circuit 10 operates when the end of the magnetic tape 2 is detected to generate an alarm sound from the speaker 7.

Next, when the recording cancel signal is applied to the terminal 14b during the recording operation, the transistor Q ₃ is turned on and the transistor Q ₁ is turned off. Therefore, energization of the relay RY ₁ is cut off and the switches S ₁ , S ₂ , S ₃ and S ₈ are closed to the PB side again. The transistor Q ₂ is turned off because the power supply B ₂ is lost from the REC contact of the switch S ₈ , the energization of the relay RY ₂ is cut off, and the switches S ₄ , S ₅ , S ₆ and S ₇ are also returned to the PB side. Closed. Then, the circuit is released from recording, and the playback state is set to perform normal playback operation. In other words, the reproduction signal from the magnetic head 1 is applied to the output amplifier 6 via the preamplifier 4 and the amplifier 5 to drive the speaker 7.

Next, a case will be described in which a cassette without a click, that is, a cassette in which recording has been completed or a cassette is not mounted.

In this case, the switch S ₉ is closed to the NON-REC side, and the other switch S _{1 ...} S _{8 is} also closed to the PB side. In this state, when the recording command signal is applied to the terminal 14a, the transistor Q ₂ is turned on so that the relay RY ₂ is energized, and the switches S ₄ , S ₅ , S ₆ and S ₇ are switched to the REC side.

As switch S ₇ is closed to the REC side, power supply B ₁ is applied to contact NON-REC of switch S ₉ . The power supply B ₁ is applied to a transistor Q ₄ collector via a resistor R _4, it is applied to the further base of the diode D ₂ of transistor Q ₂ through keeping the ON state of the transistor Q _2, and the relay RY ₂ is a self-holding do. The power supply B ₁ is also applied to the base of the transistor Q ₄ through the resistors R ₅ , R ₆ , R ₇ and the capacitor C ₁ , but the time constant of the integrated circuit by both the resistor R ₅ and the capacitor C ₁ ( For this reason, the base potential does not rise until the transistor Q ₄ is turned on. The power supply B ₁ is also applied to the base of the transistor Q ₅ through the resistor R ₈ , and the transistor Q ₅ is turned on to operate the alarm signal generating circuit 10 to emit an alarm sound from the speaker 7. .

The next time the base of the transistor Q ₄ to fully rise, the transistor Q ₄ is turned on, and thus the transistor Q ₂ is the energization of the relay RY ₂ is cut off to be turned off. Then, by closing the switches S ₄ , S ₅ , S ₆ and S ₇ again to the PB side, the power supply B ₁ is interrupted, the transistor Q ₄ is turned off, and the self-holding voltage of the transistor Q ₂ disappears and the alarm signal generating circuit 10 Also stops the operation. The circuit then returns to the regeneration state.

Therefore, when the recording command signal is inadvertently applied when the tape recorder is in a recording disabled state, only the relay RY ₂ is activated and an alarm sounds during the time determined by the time constant by the resistor R ₅ and the capacitor C ₁ . And the alarm stops and the circuit automatically returns to the regeneration state.

In addition, even when a recording command signal is applied to the terminal 14a by mistake during the reproducing operation, the relay RY ₂ is operated so that the switches S ₄ , S ₅ , S ₆ , and S ₇ are closed to the REC side. After the alarm sound is issued by the predetermined time, the self-holding of the relay RY ₂ is terminated, and each of the switches S ₄ , S ₅ , S ₆ , and S ₇ is closed again to the PB side, so that the playback sound can be heard again from the speaker 7. This operation is also performed when the tape recorder is in a stopped state.

FIG. 2 is a simplified system diagram of the main part of the circuit of FIG. 1. The same reference numerals are attached to the same parts as the first diagram.

Since the detailed description of the drawings is the same as described above, the descriptions thereof are omitted. However, when the recording availability detecting switch S ₉ detects the recording value and closes to the REC side, the relays RY ₁ and RY ₂ operate, and in this case, the power supply B ₂ It is used as a self holding voltage. When the switch S ₉ detects the non-recording and closes the NON-REC side, the relay RY ₁ does not operate, and only the relay RY ₂ is driven by the power supply B ₁ through the integrating circuit C ₁ R ₅ and the transistor Q ₄ for a predetermined time. The self-holding is performed, and the alarm signal generating circuit is operated during this time. After a predetermined time elapses, the self-holding is released, the alarm sound is stopped, and the circuit can be automatically returned to the regeneration state.

According to the present invention, there is provided a first switch, for example, a switch S ₇ , which has a self-holding circuit by a transistor Q ₂ and is connected to a power supply and is turned on by applying a recording operation, for example, a recording command signal. A second switch, for example, switch S ₉ , connected to the power supply through the first switch, by detecting a negative state and being turned on by a non-recordable state, and an alarm signal to which the power is supplied by turning on the second switch. A second switch for controlling the generation circuit and the magnetic holding circuit, for example, transistor Q _4, is provided, and the third switch is turned on for a predetermined time by, for example, an integrating circuit after the power is turned on, and the magnetic By holding the holding circuit self-holding for a predetermined time, if a recording operation is accidentally performed in a state where recording is impossible, an alarm sound is issued for a certain period and the user cannot record. The alarm can be notified and the circuit automatically returns to the playback state after the alarm is stopped. Therefore, it is not necessary to apply a release signal. Especially, it can be used for a remote control type tape recorder to achieve a thorough effect. .

Claims (1)

And switching means for switching at least a part of the recording and reproducing circuit from the reproducing state to the recording state by the recording command signal to hold the state by itself, the recording allowance detecting means, the alarm signal generating means, and the time constant means, When the recording availability detecting means detects that recording is impossible, when the recording command signal is applied, the switching means stops after operating only the predetermined time set by the time constant means by the alarm signal generating means. Recording and reproducing by the switching means.