JPS6347088Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a car stereo device with a radio.

With conventional devices of this kind, if you want to switch to the radio while a cassette tape is loaded and playing, you must first eject the cassette tape and then turn on the radio's power switch to turn on the radio. need to start. On the other hand, if you want to switch to tape playback and then stop playback while the radio's power switch is on, first insert a cassette tape to automatically switch to tape playback, and then press the eject button. It was necessary to go to the radio, eject the cassette tape, interrupt playback, and then turn off the radio's power switch.

As described above, the conventional devices require extremely troublesome manual operations for switching between the radio and the car stereo, resulting in poor operability.

Therefore, the present invention was devised to eliminate the above-mentioned drawbacks of the conventional technology, and it is possible to switch from tape playback to radio using the operation for supplying power to the radio, and to stop all functions using the eject operation. An object of the present invention is to provide a car stereo device with a radio that improves operability.

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

In the figure, SW1 is a normally open radio switch that is turned on only during operation; SW2 is a normally open tape switch that is turned on when a cassette tape is loaded; 1 is a tape deck circuit section to which tape switch SW2 is connected; It has a playback control input that starts playback when the radio +B power rises from L to H level when turned on, an eject control input that performs an eject operation when the radio +B power rises from L to H level, and a deck +B power input.

2 is a T-type flip-flop (F/F) whose trigger input T is connected to a radio switch SW1 via a diode _D1 ;
The output Q is alternately inverted from L to H or from H to L in response to the rise to the level. 3, the radio switch SW1 is connected to the set input S, and the tape switch SW2 is connected to the reset input R via the one-shot multi 4, and each input is connected from L to H.
It is an R-S type flip-flop (F/F) that is set and reset according to the rise to the level.
With that set, the output Q changes from L to H, and the output changes to H.
By resetting, the output Q is inverted from H to L, and the output is inverted from L to H by reset.

Output Q of the above T type F/F2 and R-S type F/F3
The output Q of is connected to the AND gate 5. The output of the AND gate 5 is connected to the control input of the power amplifier +B power switch circuit 6 via the diode _D2 , and is also directly connected to the control input of the radio +B power switch circuit 7. Above R-
The output of SF/F3 is connected to AND gate 8 together with tape switch SW2. The output of the AND gate 8 is connected to the control input of the power amplifier +B power switch circuit 6 via the diode _D3 , and is also directly connected to the control input of the tape deck +B power switch circuit 9.

When turned on, the power amplifier +B power switch circuit 6 supplies power to the power amplifier 10, and also supplies power to the radio (not shown) and tape deck 1 via switch circuits 7 and 9, respectively.

Note that the output Q of the T-type F/F 2 and the output of the one-shot multi 4 are connected to an AND gate 11, and the output thereof is connected to the input of the T-type F/F 2. Further, D ₄ is a backflow blocking diode.

Assuming that the cassette tape is currently installed on the tape deck, when the cassette tape is installed, the R-
Since the S type F/F 3 has been reset and its output is at H level, both inputs of the AND gate 8 become H, and its output becomes H. As a result, the switch circuits 6 and 9 are in the on state. Power is supplied to the tape deck 1 via switch circuits 6 and 9, and power is also supplied to the power amplifier 10 to perform a cassette tape playback operation.

When the above condition occurs, the radio switch
When SW1 is turned on, T-type F/F2
is triggered and its output rises from L to H, and R-SF/F3 is set and its output Q
is inverted from L to H, and the output is inverted from H to L. Therefore, the output of AND gate 5 changes from L to H, and the output of AND gate 8 changes from H to L, thereby turning on switch circuit 7 instead of turning off switch circuit 9. Note that since the switch circuit 6 is kept in the on state, in response to the switch circuit 7 being turned on, the eject input of the tape deck circuit section 1 rises to H, an eject operation is performed, and the cassette tape is ejected.
Power is supplied to the radio, and the output of the radio is amplified by the power amplifier 10.

In short, when switching to the radio during tape playback, the cassette tape is ejected and the radio is switched by turning on the radio switch SW1.

Next, when the radio is in operation as described above, when a cassette tape is loaded, switch SW2 is turned on and one-shot multi-4 is turned on.
The input rises from L to H, and the one shot multi 4 is triggered. Therefore, the output of the one-shot multi 4 rises, and in response, the R-S type F/
F3 is reset and its output Q changes from H to L, and at the same time, the output of the AND gate 11 changes from L to H, triggering the T-type F/F2 and changing its output Q. falls from H to L.

As a result of the above, the output of the AND gate 5 becomes L and the output of the AND gate 8 becomes H, and the switch circuit 9 is turned on instead of the switch circuit 7 being turned off. At this time, since the reproduction input to the tape deck circuit section 1 is at H level, the reproduction operation of the tape deck is started. If you want to stop the operation during tape playback, just turn on the ejection switch SW3.When the switch SW3 is turned on, the cassette tape is ejected and the tape switch SW2 is turned off. Then, the output of the AND gate 8 changes from H to L, turning off both switch circuits 6 and 9, cutting off power supply to the power amplifier 10 and tape deck circuit 1, and stopping all functions.

As explained above, according to the present invention, when switching from tape playback to radio, there is no need to perform an eject operation; the switch is completed simply by turning on the radio switch, and after switching from radio to tape, all functions are restored. If you want to stop the radio, you only need to perform the eject operation, eliminating the need to separately turn off the radio power as in the past, improving operability by reducing the number of operations.

[Brief explanation of the drawing]

The drawing is a block diagram showing an embodiment of the present invention. SW1...Radio switch, SW2...Tape switch, SW3...Eject switch, 1...
... Tape deck circuit section, 2 ... T-type flip-flop, 3 ... R-S type flip-flop, 5, 8
...and gate, 7...radio +B power switch circuit, 9...tape deck +B power switch circuit.

Claims (1)

[Scope of utility model registration request] a first manually operated switch means; an inverting circuit means which is triggered each time the switch means is operated to invert the output; a set-reset circuit means which is set by the operation of the switch means; a tape switch means which is activated by the loading of a cassette tape to reset the set-reset circuit means and to put the tape deck circuit into a playback state; means for generating a signal for triggering said inverting circuit means upon actuation of said tape switch means, said radio circuit being configured to operate when said inverting circuit means is in one state and said set-reset circuit means is in a set state; Supply power and put the tape deck circuit in the eject state.
A car stereo device with a radio, characterized in that when the tape switch means is activated by loading a cassette tape and the reset circuit means is in a reset state, power is supplied to the tape deck circuit section. .