JPS6346907Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a warning device for preventing forgetting to change the changeover switch in a tape recorder in which the changeover switch is changed according to the type of tape and recording characteristics of the tape such as noise reduction. It is.

Recently, recording tapes include Normal, FeCr,
Tapes with different recording characteristics, such as CrO ₂ and Metal, have appeared, and as a result, recording stores and playback equipment have begun to switch their internal equalizers and bias circuits to accommodate these types of tapes and use them with optimal characteristics. It's here. Conventionally, in such cases, when the changeover switch was turned on, the corresponding lamp would turn on, or the position of the changeover switch knob would be used to recognize the changeover. However, in view of the increasingly complex operation of tape recorders, these switching display methods have the disadvantage that switching is often forgotten and the tape is used with its characteristics degraded.

The present invention was developed to solve these drawbacks. When a cassette tape is completely inserted into a tape recorder, a warning signal is output for a certain period of time by flashing light and/or sound, and when that time has elapsed, a warning signal is output by flashing light and/or sound. Then, the light is turned on statically and/or the sound is muted. Therefore, the warning signal actively prompts switching, and can prevent forgetting to switch.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes the front panel of a tape recorder, and the front panel 1 includes a cassette lid 2 for storing cassette tapes, a switch 3 for selecting the type of tape, i.e., Normal, FeCr, CrO ₂ , and Metal. 4, 5, 6, display lamps 7, 8, 9, 10 as warning signal output circuits, noise reduction changeover switches 11, 12, and display lamps 13, 14 as warning signal output circuits. Furthermore, there are various knobs such as a cassette eject button, a record button, a play button, a fast forward button, a rewind button, a tape counter, and a meter.

Next, Fig. 2 shows a switching warning circuit, in which the indicator lamps 7, 8, 9, and 10 and the changeover switches 3, 4, 5, and 6 form pairs, one each, and four sets are parallel to each other. One end is connected to the power supply terminal +B, and the other end is connected to the transistor 15 and the intermittent signal generation circuit 16. Only one of the changeover switches 3, 4, 5, and 6 is selectively turned on;
6, a reset switch 17 is temporarily turned on.

Next, 18 is a timer circuit consisting of a monostable multivibrator, and this timer circuit 1
8, two transistors 19, 20, one capacitor 21, five resistors 22, 23, 24, 2
5 and 26, and when a trigger signal is input to the input terminal 27, the output terminal 28 is activated for a time t determined by the time constant of the capacitor 21 and the resistor 23.
is reversed. Input terminal 2 of this timer circuit 18
7 includes a timing switch 3 which is closed when the cassette lid 2 is closed via a trigger signal generating circuit 31 having a capacitor 29 and a resistor 30 connected in parallel.
2 are connected. Further, the timer circuit 1
The output terminal 28 of 8 is connected to a transistor 36, a trigger input terminal 37 of the intermittent signal generating circuit 16, and an intermittent signal drive transistor 38 via resistors 33, 34, and 35, respectively. The collector of the transistor 36 is connected to the transistor 15.
It is connected to the base of , and is also connected to the power supply terminal +B via a resistor 39. Furthermore, the reset terminal 40 of the timer circuit 18 is connected to the reset switch 17 and also to the power supply terminal +B via a resistor 41.

Next, the operation of the device according to the present invention will be explained.

When a cassette tape is loaded and the cassette lid 2 is closed, the timing switch 32 is closed and a pulse-like trigger signal is generated in the trigger signal generating circuit 31. When this trigger signal is applied to timer circuit 18, transistor 19 is turned on and transistor 20 is turned off. In this state, the resistor 23
This continues for a time t determined by the time constant of the capacitor 21. During this time t, transistor 2
0 collector potential rises and the transistor 36
is turned on and transistor 15 is turned off. At the same time, the drive transistor 38 is turned on and the intermittent start signal is sent to the trigger input terminal 37, so that the intermittent signal generation circuit 16 outputs an intermittent signal. Therefore, changeover switches 3, 4, 5, 6
The display lamp 7 corresponding to the closed changeover switch 3 repeatedly lights up intermittently, that is, blinks, and attention is drawn to it. Then, check the type of tape with the flashing indicator lamp 7, and if it matches, leave it alone. When the time t elapses in this left state, the timer circuit 18 turns off the transistor 19 and turns on the transistor 20, returning to the original state again. As a result, the transistor 38 is turned off, the intermittent signal generation circuit 16 is stopped, the transistor 36 is turned off, and the transistor 15 is turned on, so that the display lamp 7 is turned on again.

In the flashing state, if it is found that the type of tape does not match the flashing indicator lamp 7, the corresponding changeover switch 6, for example, is switched. Then, the reset switch 17 is momentarily turned on in conjunction with the changeover switch 6, so the capacitor 21 of the timer circuit 18 is rapidly discharged, the transistor 19 is turned off, the transistor 20 is turned on, and the output terminal 28 is turned on. The potential becomes low. Therefore, the transistor 36 is turned off, the transistor 15 is turned on, and at the same time, the transistor 38 is also turned off, and the display lamp 10 remains lit even before time t has elapsed. The same holds true when switching to other changeover switches 4 and 5.

Next, the noise reduction switch 11,
In case 12, it is sufficient to operate it using the same circuit as in Fig. 2 (only two sets of changeover switches and indicator lamps, the rest is the same as in Fig. 2), and the circuit can be switched depending on the type of tape. Either leave the switches 11 and 12 as they are, or change them.

In the above embodiment, one indicator lamp was provided corresponding to each of the tape type switching switch and the noise reduction switching switch.
This is to give a warning, so one for each type of tape and one for noise reduction, or one for all.
May be individual. In this case, it is desirable to be able to tell which changeover switch is closed using a switch knob or the like. Further, in the above embodiments, a lamp was used to generate light as a warning signal, but an LED may also be used. Furthermore, although light was used as the warning signal in the above embodiment, it may be sound, or both light and sound may be used simultaneously.

Since the present invention is constructed as described above, when a cassette tape is loaded, a warning signal is used to notify whether or not the circuit has been switched to an appropriate circuit according to the characteristics of the tape. Therefore, it is possible to avoid being forced to change the changeover switch and forgetting to do so before recording or playing back the tape.

[Brief explanation of the drawing]

FIG. 1 is a front view of a tape recorder, and FIG. 2 is an electrical circuit diagram showing an embodiment of a warning device according to the present invention. 3, 4, 5, 6, 11, 12... Changeover switch, 7, 8, 9, 10, 13, 14... Display lamp as warning signal output circuit, 16... Intermittent signal generation circuit, 17... Reset Switch, 18...
Monostable multivibrator as a timer circuit, 21... capacitor, 23... resistor,
31...Trigger signal generation circuit.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a tape recorder equipped with a plurality of changeover switches that change internal circuits according to the recording characteristics of the cassette tape to be loaded, a trigger signal is generated in conjunction with the loading of the cassette tape. a trigger signal generation circuit that generates a trigger signal; a timer circuit that outputs an output signal for a certain period of time in response to this trigger signal; an intermittent signal generation circuit that outputs an intermittent signal by the output of this timer circuit; 1. A warning device for a tape recorder comprising: a warning signal output circuit coupled via a switch; and a reset switch interlocking with the changeover switch to reset the timer circuit. (2) The timer circuit is a warning device for a tape recorder according to claim 1, wherein the timer circuit comprises a monostable multivibrator that is reversed after a certain period of time using a time constant of a capacitor and a resistor. (3) The warning device for a tape recorder according to claim 1 or 2, wherein the warning signal output circuit comprises an element that generates light and/or sound. (4) A warning device for a tape recorder according to claim 1, 2, or 3 of the utility model registration claim, wherein the changeover switch is provided for one for each type of tape and one for noise reduction.