JPS6045489B2 - Timer recording display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device for a tape recorder having a timer recording function that automatically enters a recording state when the power is turned on in advance with a recording mode and a timer.

Generally, with a tape recorder that has this type of timer recording function, the timer is set to a predetermined time and the timer recording switch is operated, and when the power is turned on by the timer at the predetermined time, the recording amplifier operates normally and records. After a period of time (hereinafter referred to as "unsuccessful time") has elapsed, the solenoid that puts the mechanism in the recording state is driven, and the signal transmission to the recording amplifier is started to enter the recording mode.

In such conventional devices, if you make timer recording on one cassette tape and then accidentally insert another cassette tape and turn on the power while leaving the timer recording switch on, the device automatically enters recording mode. There was a drawback that the recorded information could be erased by mistake.

The present invention eliminates the drawbacks of the prior art and makes it possible to prevent erroneous erasure by displaying a warning using the dead time until the tape starts running when the power is turned on with the timer recording switch on. The purpose is to provide a tape recorder.

In the present invention, there is provided a delay means for providing a delay time, a signal derivation means for deriving a predetermined display signal output during the delay time set by the delay means, and a lighting display by the signal output of the signal derivation means. A display means and a switch means J connected between the signal deriving means and the display means and closed when the recording mode is operated are provided to display a warning that the recording mode is set during the delay time after the power is turned on. do. The present invention will be explained in detail below with reference to an embodiment of the circuit shown in the drawings.

In the drawing, reference numeral 19 denotes a control circuit having a timer function, which includes an input terminal 19a connected to the playback switch 15, and an input terminal 19 connected to the recording switch 16.
b) An output terminal 19c for deriving a timer output, an output terminal 19d for deriving a solenoid control output, and an output terminal 19e for deriving a recording amplifier control output. This control circuit 19 is set to operate when a low level input is applied to input terminals 19a and/or 19b. When the power is turned on now, since the capacitor 14 is not charged immediately after the power is turned on, current flows from the power supply through the resistor 11 to the resistor 12 and the capacitor 14.
Since no current flows through the base of transistor 13, transistor 13 is in an off state.

As a result, the power supply voltage is applied to the collector of the transistor 13 via the resistor 10 and is at a high level, so that the control circuit 19 does not operate even if the playback switch 15 and the recording switch 16 are turned on. At this time, when the timer recording switch 22 closes the timer playback switch 23 and the timer switch 24 to set timer recording,
The pulse signal from the astable multivibrator 27 is AN
It is input to the base of the transistor 30 via the D circuit 26, the resistor 25, and the timer switch 24, and the transistor 30 repeats on and off as the pulse signal of the astable multivibrator 27 becomes high label and low level. When the transistor 30 is on, the LED from the power supply
A collector current flows through the LED 28 and the resistor 29.
lights up, and when the transistor 30 is off, collector current flows and the LED 28 turns off, causing a blinking display. Next, when the capacitor 14 is gradually charged and the voltage across it reaches a certain level, the transistor 13 is turned on and the collector voltage becomes almost equal to the emitter voltage and becomes a low level.
While accepting the operation key input of the recording switch 16,
Since a low level is applied to the input of the ND circuit 2q, the output is at a low level regardless of the input from the astable multivibrator 27, the transistor 30 is turned off, and the LED 28 is turned off.

Also, since a low level pulse is output to the timer output terminal 19c of the control circuit 19, the timer playback switch 22, diode 48, and timer recording switch 2
As a result, the output is fed back to the input terminals 19a and 19b of the control circuit 19 through the series circuit of 3 and the diode 17, and as a result, a solenoid control output and a recording amplifier control output are output from the output terminals 19d and 19e, and the solenoid control circuit 20 and the recording amplifier 21 are activated, and the mechanism is set to the recording state by the operation of the solenoid, and the recording amplifier starts transmitting signals and enters the recording state. As described above, according to the present invention, even if the power is turned on with the timer recording switches 22, 23, and 24 set by mistake, the display element (LED
28) displays the point decrement, and if the timer setting is canceled during that time, the recording state will not be activated, making it possible to prevent erroneous erasure.

[Brief explanation of the drawing]

The drawing is a circuit diagram of an embodiment of a timer recording and display device according to the present invention. 13, 30: Transistor, 14: Capacitor, 15:
Playback switch, 16: Recording switch, 19: Control circuit, 22: Timer recording switch, 23: Timer playback switch, 24: Timer switch, 26: AND
Circuit, 27: Monostable multivibrator, 28: LED
.

Claims (1)

[Claims] 1. In a magnetic tape recording device that has been configured to perform a timer recording operation in advance and enter the recording state automatically when the power is turned on, the time from when the power is turned on until the recording amplifier operates normally and becomes ready for recording. a delay means for providing a dead time in a mechanism control circuit so as to inhibit the running of the magnetic tape; a signal deriving means for deriving a predetermined display signal output during the delay time set by the delay means; and the signal deriving means. and a switch means connected between the signal deriving means and the display means and closed when the recording mode is operated. A timer recording display device characterized in that a recording mode is displayed during a delay time.