JPH0252332B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cassette tape recorder with an auto-reverse device.

[Conventional technology]

Conventionally, when loading a cassette tape into a tape recorder, before loading the cassette half, look at the side symbols (A, B, or 1, 2) written on the cassette half to determine the side of the tape to be played or recorded (hereinafter referred to as the "playing side"). ) and insert it into the holder so that the desired tape side will be played or recorded.

However, once the cassette tape is loaded, the side signal can only be checked visually through the cassette lid, making it very difficult to see, and depending on the model, the side signal cannot be checked until the tape is removed again.

In particular, in cassette tape recorders capable of auto-reverse recording and playback, the tape side during operation is unclear, and the probability of erroneous recording operations due to carelessness is high.

Therefore, it has been proposed that a cassette tape recorder with an auto-reversing device be able to directly specify the side of the tape to be played or recorded after the cassette tape is loaded, regardless of its loading status (Utility Model Application No. 57-71260). (see official bulletin).

[Problem to be solved by the invention]

However, even with such a cassette tape recorder, users are concerned if the tape side that is actually specified and available for playback or recording is not displayed. If the output is different each time depending on the state of the control circuit at that time, there is a problem that it is difficult for the user to understand and the operation feeling is poor.

The present invention has been made in view of these points, and provides a cassette tape recorder with an auto-reversing device that can directly specify the tape side for playing or recording a cassette tape as described above.
To improve the operational feeling by displaying the specified tape side, enabling reproduction or recording of the same tape side and displaying the same tape side whenever the power is turned on.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a tape side detection means for detecting the tape side based on the presence or absence of a screw hole in the cassette half surface of a loaded cassette tape or an assembly screw therein;
The tape side specifying means is provided with a tape side specifying means for specifying the tape side on which a cassette tape is to be played or recorded, and a control circuit for switching an auto-reverse system control signal according to the detection result and the specification by the tape side specifying means. Accordingly, in a cassette tape recorder equipped with an auto-reverse device that allows the user to directly specify the tape side for playback or recording of a cassette tape regardless of its installed state, an indication indicating the tape side specified by the above-mentioned tape side specifying means is provided. and the control so that when the power is turned on, the device always generates a signal specifying one tape side, displays that tape side on the display device, and enters a standby state for playing or recording the tape side. A circuit for controlling the circuit is provided.

[Effect]

The cassette recorder with an auto-reverse device according to the present invention configured as described above detects the mounting state, that is, the tape side, when a cassette tape is loaded, and controls the control circuit according to the detection result and the designation by the tape side designation means. switches the auto-reverse system control signal to ensure that the specified tape side can be played or recorded.

Further, the display device displays the specified tape side, always displays one tape side when the power is turned on, and at the same time enters a standby state for playing or recording that tape side.

〔Example〕

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

Figures 1a and 1b show the appearance of side A and side B of a very common cassette tape 10, 11 is a cassette half on side A, 12 is a cassette half on side B, and 13 to 17 are shown. are the screws used to assemble them.

The screws 13 to 17 are screwed into screw holes 18 to 22 provided in the cassette half 11 on the A side, respectively, with their heads recessed, and do not appear on the cassette half 12 on the B side.

The height difference between the heads of screws 13 to 16 and the surface of cassette half 11 is approximately 0.2 mm, and screw 17
With it is about 2.5mm. In addition, whether in Japan or abroad, in cassette halves that are secured with five screws, the positional relationship of the screws is almost the same.

Therefore, by detecting the presence or absence of any of these five screws or their screw holes, it is possible to detect the tape side of most cassette tapes.

FIG. 2 is a partially cutaway perspective view of a cassette tape recorder showing an embodiment of the present invention when a cassette tape is installed therein.
It is the same as a conventional general cassette tape recorder in that a recording head 4 and a recording head 4 are attached.

FIG. 3 is an enlarged view of the tape side detection mechanism.

As shown in the figure, a detection lever 6 is rotatably supported and attached to a bracket 5 fixed to the bottom surface 1a of the cassette mounting portion of the tape recorder 1.
Due to the spring 7, the detection end 6a is connected to the cassette tape 1.
It is biased to move toward 0.

A contact piece 8a of the leaf switch 8 is in contact with a bent portion 6b provided at the end opposite to the detection end 6a of the detection lever 6, and the detection end 6a is pushed down and the detection lever 6 is moved as shown in FIG. When the car turns left, leaf switch 8 is turned on.

Further, this detection lever 6 is used to insert the cassette tape 10 so that the cassette half 12 faces the front side as shown in the figure, that is, when the B side is ready for playback or recording.
is attached so that the detection end 6a is located at the screw hole 22 on the cassette half 11 when the cassette half 11 is attached.

Therefore, at this time, the detection end 6a of the lever 6
As shown in FIG. 3, the leaf switch 8 is inserted into the screw hole 22 of the cassette half 11 until it contacts the head of the screw 17, and is rotated to the right by the spring 7, so that the leaf switch 8 is in the OFF state.

On the other hand, when the cassette tape 10 is loaded so that the cassette half 11 faces the front side, that is, in a state where side A can be played or recorded, a screw hole exists on the cassette half 12 that contacts the detection end 6a. Therefore, the detection end 6a is pushed down and the lever 6 is rotated to the left, and the bent portion 6b of the lever 6 pushes down the contact piece 8a of the leaf switch 8 to turn it on.

Next, another example of the tape side detection means will be explained with reference to FIGS. 4 and 5.

Fig. 4 shows a tape side detection means that detects the heads of screws 13 to 17 (see Fig. 1a) that assemble the cassette halves 11 and 12 by utilizing the fact that they are conductors. shows.

In this example, the elastic contact pieces 8a', 8b' of the leaf switch 8' are bent at right angles and arranged so that their tips are inserted into the screw holes 22 of the cassette half 11.

Therefore, as shown in FIG. 4, when the cassette tape 10 is loaded to play or record side B, both ends of the contact pieces 8a' and 8b' of the leaf switch 8' are connected to the screws of the cassette half 11. Since it is inserted into the hole 22 and comes into contact with the head of the screw 17, both contact pieces 8a' and 8b' are electrically connected through the head, and the leaf switch 8' is turned on.

Conversely, when the cassette tape 10 is loaded so that side A is played or recorded, both tips of the contact pieces 8a' and 8b' of the leaf switch 8' touch the surface of the cassette half 12, but there is no contact there. Since there is no screw, there is no conduction, and the leaf switch 8' remains in the off state.

FIG. 5 shows a tape side detection means that magnetically detects the presence or absence of screws by utilizing the fact that the screws 13 to 17 that assemble the cassette halves 11 and 12 are made of a magnetic material such as iron. shows.

In this example, a core 25 around which an input coil L ₁ and an output coil L ₂ are wound is provided so that its air gap faces the screw hole 22 of the cassette half 11, and the input coil L ₁ is connected to an oscillator 26. The output coil _L2 is connected to an amplitude detection amplifier 27, and the relay switch 28 is controlled by its output.

When a constant alternating current is caused to flow through the input coil _L1 by the oscillator 26, the magnetic resistance of the air gap of the core 25 changes greatly depending on the presence or absence of the screw 17, so the output current generated in the output coil _L2 changes. Amplitude changes. The amplitude detection amplifier 27 amplifies the output current from the output coil _L2 , and controls the relay switch 28 to be turned on or off depending on the magnitude of the amplitude so that, for example, the relay switch 28 is turned on when the screw 17 is absent and turned off when it is present.

In addition, in each of these tape side detection means, the screw hole 22 in the center of the cassette half 11
Alternatively, although the screw 17 is detected, any screw hole or screw used for detection may be selected from among the five locations, and reliability may be improved by detecting a combination of multiple screw holes or screws. can.

FIG. 6 shows an example of a control circuit in an embodiment of the invention.

In the figure, S ₁ to _{S 4} are operation switches of the tape recorder, and S ₁ and S ₂ are switches for specifying side A and side B, which serve as tape side specifying means.
_S3 is a switch for fast forwarding, and _S4 is a switch for rewinding.

Reference numeral 29 denotes a switch of the tape side detection means described above, which includes the leaf switch 8 in FIG. 3, the leaf switch 8' in FIG. 4, and the relay switch 28 in FIG.
However, in the following explanation, it is assumed that the switch has an on/off operation similar to the leaf switch 8 in FIG. 3.

30 is a flip-flop circuit that holds a designated tape side signal (designated side signal); 31 is a flip-flop circuit that holds the designated side signal held by the flip-flop circuit 30 and the tape side signal (installed) detected by the leaf switch 8; This is an EX-OR circuit that creates a signal to switch the system control signal using the side signal).

Reference numerals 32 to 42 designate a NAND circuit, a NOT circuit, and an OR circuit that constitute a logic switch circuit that generates each output signal for switching the system control signal using the switching signal generated by the EX-OR circuit 32.

Further, 43 is an OR circuit with an inverted input for creating a play signal for starting playback or recording from the designated side signals generated by the operation switches S ₁ and S ₂ ;
45 is a NOT circuit for inverting the fast forward signal and rewind signal generated by the operating switches _S3 and _S4 , and _R1 to _R6 are voltage supply resistors.

The capacitor _C1 forms a time constant circuit with the resistor _R3 , and the set terminal of the flip-flop circuit 30 is set so that the A side is always in standby (the A side can be played or recorded) when the power is turned on. This circuit generates and sets a set signal that brings S to low level "L" for a short time, and sets the Q output to "H". At that time, turn the tape side A
A diode _D1 is connected to prevent the set signal specified on the screen from becoming a play signal.

A to d are system control signal output terminals of this circuit, which are connected to a system control circuit of a tape recorder equipped with this circuit.
In other words, terminal a is forward (FWD), terminal b
is connected to the system control signal input terminals of reverse (REV), terminal c to fast forward (FF), and terminal d to rewind (REV).

On the other hand, 46 is an indicator lamp that is lit during A-side operation, and 47 is an indicator lamp that is lit during B-side operation. 48, 49 are the display lamps 46, 4
7 and is controlled by the Q output signal and output signal of the flip-flop circuit 30, respectively.

50 is a multi-vibrator with an oscillation frequency of around 1 Hz, and when the tape recorder is in standby other than play mode, or when fast forwarding or rewinding, the indicator lamp 4
This is for generating a reference signal for blinking 6 or 47.

Further, the terminal e is connected to the play operation signal system of the tape recorder, and the signal controls the transistors 48 and 49 via the transistors 51 to 53. Note that R ₇ to R ₁₁ are resistors for current control.

These indicator lamps 46, 47 and the above-mentioned circuits for driving them constitute a display device.

Next, the operation of this circuit will be explained step by step with reference to the time chart shown in FIG. In addition, Fig. 7 a to wo correspond to each point A to F in Fig. 4 and a to d.
The signals of each output terminal are shown.

When a cassette tape is loaded into a tape recorder with side A facing up, that is, when side A is being played or recorded in forward direction, the switch 29 is turned on, and point G is at 0 potential as shown in FIG. It becomes “L”.

Further, as mentioned above, the flip-flop circuit 30 is set by the set signal generated by the time constant circuit consisting of the resistor _R3 and the capacitor _C1 when the power is turned on, and the H point is set by the Q output of the flip-flop circuit 30. As shown in the figure, the potential is high. Therefore, the output of the EX-OR circuit 31 becomes "H", and a standby state is established in which side A can be played forward or recorded.

When operating switch S ₁ is pressed in this state, one input of the OR circuit 43 becomes "L", so a play signal "H" is output, which is the output of the NAND circuit 33, NOT
After passing through the circuit 39, the terminal a becomes "H" as shown in FIG.

Next, when operating switch S ₃ is pressed, NOT circuit 4
4, passes through the NAND circuit 35, OR circuit 41, and the seventh
As shown in the figure, when the terminal c becomes "H" and fast forwarding of side A starts in the forward state, when the operation switch _S4 is pressed, the NOT circuit 45 and the NAND circuit 3
7. After passing through the OR circuit 42, the terminal d becomes "H" as shown in FIG. 7, and rewinding of side A is started.

Furthermore, when operating switch _S2 is pressed in this state, the flip-flop circuit 30 is immediately reset and the H point becomes "L" as shown in FIG. 7, so the output of the EX-OR circuit 31 is "L". "become,
The output of the NOT circuit 32 becomes "H".

At the same time, the OR circuit 43 outputs a play signal "H"
is output and terminal b is set to "H" through the NAND circuit 34 and NOT circuit 40 as shown in FIG.

Thereafter, when the operation switch _S3 is pressed, the terminal d becomes "H", and when the operation switch _S4 is pressed, the terminal c becomes "H", and fast forwarding and rewinding of side B are started in the reverse state.

Next, reverse the cassette tape and insert it into the tape recorder with the B side facing up, and the switch 29 will turn on.
is turned off, and the G point becomes "H" as shown in FIG. 7E.

When operating switch _S1 is pressed in this state, the flip-flop circuit 30 is immediately set, the H point becomes "H" as shown in the figure, the output of the EX-OR circuit 31 becomes "L", and the NOT circuit 32 becomes "H". The output changes to "H". At the same time, the signal from S ₁
The output of the OR circuit 43 becomes "H", and the terminal b is brought to "H" through the NAND circuit 34 and NOT circuit 40 as shown in FIG.

Similarly, when operating switch S ₃ is pressed, terminal d becomes "H", and when operating switch S ₄ is pushed, terminal c becomes "H", and fast forwarding and rewinding of side A are started in reverse mode. .

Therefore, when the operating switch _S2 is pressed, the flip-flop circuit 30 is immediately reset, the H point becomes "L", and the output of the EX-OR circuit 31 becomes "H".
Then, the output of the NOT circuit 32 changes to "L".

At the same time, the output of the OR circuit 43 becomes "H",
Through the NAND circuit 33 and NOT circuit 39, the terminal a becomes "H" as shown in FIG.

Then, when operating switch S ₃ is pressed, terminal c becomes "H", and when operating switch S ₄ is pressed, terminal d becomes "H", and fast forwarding and rewinding of side B are started in the forward state. .

By the way, when you turn on the power with a cassette tape installed in a tape recorder with the B side facing up, the switch 29 is off as described above, so the G
The point becomes "H", the flip-flop circuit 30 is set by the set signal generated when the power is turned on as described above, and the H point also becomes "H".
The output of EX-OR circuit 31 becomes “L” and NOT
The output of the circuit 32 becomes "H".

Therefore, a standby state is established in which side A can be played or recorded in reverse. That is, no matter which side of the cassette tape is attached to the tape recorder, the tape recorder always enters a standby state for playing or recording side A when the power is turned on.

Note that the time constant circuit consisting of resistor _R3 and capacitor _C3 is connected to flip-flop circuit 30 reset terminal R.
If the flip-flop circuit 30 is provided on the same side, the flip-flop circuit 30 will always be reset when the power is turned on, and will be in a standby state for playing back or recording the B side.

Also, by utilizing the fact that the Q output of the flip-flop circuit 30 becomes "H" when operating on the A side, and the output becomes "H" when operating on the B side, each side indicator lamp 46 or 47 of the display device is lit with that signal. I'm starting to let them do it.

Therefore, when the power is turned on, the display lamp 46 for the A-side display always lights up, and even if the operation switch _S1 is pressed afterwards, the display lamp 46 continues to light up, and when the operation switch _S2 is pressed, the display for the B-side display lights up. The lamp 47 is turned on and the display lamp 46 is turned off.

Furthermore, by combining the play operation signal from the tape recorder main body and the reference signal from the multivibrator 50, as shown in FIG.
By controlling the F point so that the light is always on during play mode and flashing during other operations, it is also possible to check the standby state.

According to this embodiment, as explained above, no matter which direction the cassette tape is loaded, if side A is specified, side A will be played or recorded and displayed, and side B will be played or recorded. If specified, side B will be played or recorded and displayed.

Further, at this time, the fast forwarding and rewinding directions are performed in a state corresponding to each designated side, regardless of the mounting state of the cassette tape.

For example, if it is installed with the B side facing up,
In other words, when side B is recorded and played forward, when side B is specified, the signal is transmitted to the forward input terminal of the tape recorder's system control circuit, the tape recorder performs forward operation, and side B is recorded and played back. . Furthermore, when side A is specified, the tape recorder operates in reverse, contrary to the previous example, and side A is recorded and played back.

If the cassette tape is loaded with the A side facing up, specifying the B side will cause reverse operation, specifying the A side will cause forward operation, and each specified side will perform recording and playback. It will be done.

With regard to fast forwarding and rewinding, the conventional device could not handle the tape side, but this embodiment can handle it.

In other words, attach it so that the A side is the front side.
If the screen is specified, the fast forward signal is transmitted to the fast forward (FF) input terminal of the system control circuit, the rewind signal is transmitted to the rewind (REW) input terminal, and the B
If you specify a side, the fast forward signal will rewind (REW)
At the input terminal, the rewind signal is transmitted to the fast forward (FF) input terminal.

On the other hand, if you install it with the B side facing up, the situation is completely opposite to the above case, and if you specify the A side, the fast forward signal will be transmitted to the REW input terminal of the system control circuit, and the rewind signal will be transmitted to the FF input terminal. ,
If side B is specified, the fast forward signal will be sent to the FF input terminal.
The rewind signal is transmitted to the REW input terminal.

In other words, no matter what state the device is in, fast-forwarding or rewinding to the designated side is performed.

Furthermore, when the power is turned on, one tape side (A side in the above embodiment) is always displayed and the tape side is in standby mode for playback or recording, so if you want to fast forward or rewind immediately after the power is turned on, However, since the running direction of the tape can be easily recognized, operability can be improved.

Note that although a logic circuit is used in the above embodiment, an equivalent circuit can be constructed using a mechanical switch such as a relay.

〔Effect of the invention〕

As explained above, the cassette tape recorder with an auto-reverse device according to the present invention can directly specify the tape side for playback or recording, regardless of the installed state of the cassette tape, and the specified tape side can be displayed. Therefore, there is no need to check the tape side before installing the tape. This also makes it easier to select songs during playback.
During recording, the possibility of erroneous recording operations is significantly reduced.

Furthermore, when the power is turned on, the same tape side can always be played or recorded and that tape side is displayed, making it easy for the user to understand.
There is no need to check the status immediately after the power is turned on each time, and desired operations can be performed immediately. In other words, the operational feeling is significantly improved.

[Brief explanation of drawings]

Figures 1a and b are plan views of the A side and B side of a general cassette tape, respectively, and Figure 2 is a partially broken perspective view of the cassette tape installed in a tape recorder showing an embodiment of the present invention. 3 is an enlarged side view of the tape side detection mechanism, FIGS. 4 and 5 are an enlarged side view and a configuration diagram showing other different examples of the tape side detection means of the present invention, and FIG. 7 is a circuit diagram showing an example of a control circuit in an embodiment of the present invention, and FIGS. 7A to 7A are timing chart diagrams showing relationships among signal waveforms of various parts for explaining the operation of the circuit of FIG. 6. 1...tape recorder, 2...head stand, 3...
... Erasing head, 4 ... Recording head, 6 ... Detection lever, 8, 8' ... Leaf switch, 10 ... Cassette tape, 11 ... Cassette half on side A,
12...B-side cassette half, 13-17...
Screw, 18-22...screw hole, 25...core, 2
8...Relay switch, 29...Tape side detection means switch, 30...Flip-flop circuit, 30...EX-OR circuit, 46, 47...Display lamp, _S1 to _S4 ...Operation switch.

Claims (1)

[Scope of Claims] 1. Tape side detection means for detecting the tape side based on the presence or absence of a screw hole in the cassette half surface of the loaded cassette tape or an assembly screw therein, and a tape side for playing back or recording the cassette tape. a tape side specifying means for specifying the
According to the detection result by the tape side detection means and the designation by the tape side designation means,
A cassette tape recorder with an auto-reverse device, which is equipped with a control circuit for switching an auto-reverse system control signal, and is capable of directly specifying the tape side on which a cassette tape is to be played or recorded, regardless of its installed state, by the tape side specifying means. A display device for displaying the tape side specified by the tape side specifying means; and a display device that always generates a signal specifying one tape side when the power is turned on to cause the display device to display that tape side. A cassette tape recorder with an auto-reversing device, comprising: a circuit for controlling the control circuit so that the tape side is in a standby state for playing or recording.