JPH0355896B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette tape recorder with an auto-reverse device.

Conventionally, when loading a cassette tape into a tape recorder, before loading the cassette half, check the side symbol (A, B or 1, 2) written on the cassette half to determine the playback or recording side (hereinafter referred to as the "performance side").
, and insert it into the holder so that the desired side can be played or recorded.

However, once the cassette tape is installed, the side markings can only be checked visually through the cassette lid, making it very difficult to see, and some models even require the tape to be 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, especially as cassette tape recorders equipped with auto-reversing devices have become widespread, it has become necessary to be able to easily directly specify the playing side and confirm the operating tape side after loading the tape.

This invention has been made in view of the above points, and it is possible to directly specify the side of the tape to be played or recorded regardless of the installation state of the cassette tape installed in the tape recorder, and moreover, it is possible to directly specify the side of the tape to be played back or recorded. so that playback or recording of the specified tape side begins immediately,
The purpose is to improve operability.

In order to achieve the above object, the present invention provides a cassette tape recorder with an auto-reverse device, which detects the tape side by the presence or absence of a screw hole in the cassette half surface of the loaded cassette tape or an assembly screw therein. a detection means, a first switch for specifying one tape side of the cassette tape, a second switch for specifying the other tape side of the cassette tape, a detection result by the tape side detection means and the first or first switch; a control circuit that switches an auto-reverse system control signal in response to the operation of the second switch; and a circuit that generates a play signal to start playback or recording when the first or second switch is operated. provided, and by operating the first or second switch,
The tape side on which the cassette tape is to be played back or recorded is directly specified regardless of the mounting state of the cassette tape, and at the same time, the playback or recording of the specified tape side is started.

The present invention will be described in detail 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 case of 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 similar to a conventional general cassette tape recorder in that a recording/reproducing head 4 and a recording/reproducing 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 part of the tape recorder 1 in the direction of the arrow, and a spring 7 causes the detection end 6a to be attached to the cassette tape 10. It is biased so that it protrudes towards. 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 vehicle turns left, the leaf switch 8 is turned on.

Further, this detection lever 6 is operated so that the cassette half 12 faces the front side as shown in the figure, that is, when the
Cassette tape 1 with the side ready for playback or recording
The detection end 6a is located at the screw hole 22 on the cassette half 11 when the cassette half 11 is mounted.

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 turns to the left, and its bent portion 6b pushes up 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 so that side B is played or recorded, both tips of the contact pieces 8a' and 8b' of the leaf switch 8' touch the cassette half 11. Since it is inserted into the screw 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 installed to play or record side A, both tips of the contact pieces 8a' and 8b' of the leaf switch 8' touch the surface of the cassette half 12, but there are no screws there. Since there is no conduction, the leaf switch 8' remains off.

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. Connect the output coil L ₂ to the amplitude detection amplifier 27,
The relay switch 28 is controlled by the 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 there is no screw 17, 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, S ₁ is the first switch for specifying side A, and S ₂ is the first switch for specifying side B.
The second switch for specifying the side, _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.
Any of the following is acceptable.

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; EX that creates a signal to switch the operation signal using the side signal)
-It is an OR circuit. 32 to 42 are EX-OR circuit 3
These are a NAND circuit, a NOT circuit, and an OR circuit that constitute a logic switch circuit that creates each output signal for switching the operation signal using the switching signal created in step 2.

Further, 43 is an OR circuit with an inverted input for creating a play signal from the designated side signals generated by the operation switches S ₁ and S ₂ . 34, playback or recording of the designated tape side is started. 44 and 45 are NOT circuits for inverting the fast forward signal and rewind signal generated by the operation switches S ₃ and S ₄ , and R ₁ to _{R 6} are voltage supply resistors.

The capacitor _C1 forms a time constant circuit with the resistor _R3 , and is used to set the flip-flop circuit 30 to the A-side standby mode when the power is turned on. A diode _D1 is connected so that the set signal at that time does not become 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 on which this circuit is installed.
In other words, terminal a is forward (FWD), terminal b
is connected to the system control signal input terminals for reverse (REV), terminal c for fast forward (FF), and terminal d for rewind (REW).

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 and output signal of the flip-flop circuit 30, respectively. Reference numeral 50 denotes a multivibrator with an oscillation frequency of about 1 Hz, which is used to generate a reference signal for blinking the indicator lamp when the tape recorder is in standby mode other than play mode, or when fast forwarding or rewinding. 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.

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”. In addition, the flip-flop circuit 30
is set when the power is turned on, and the H point is at a high potential "H" as shown in FIG.

Therefore, the output of the EX-OR circuit 31 is “H”
Then, when the operation switch _S1 is pressed, the signal passes through the OR circuit 43, the NAND circuit 33, and the NOT circuit 39, and 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 Figure 2, terminal c becomes "H" and when operating switch _S4 is pressed, terminal d goes through NOT circuit 45, NAND circuit 37, and OR circuit 42, and becomes "H" as shown in Figure 2. become.

In addition, when the operation 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 becomes "L". become,
The output of the NOT circuit 32 becomes "H". At the same time, the output of the OR circuit 43 becomes "H",
through the NAND circuit 34 and NOT circuit 40.
As shown in Figure H, set terminal b to "H". 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".

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", passes through the NAND circuit 34 and the NOT circuit 40, and sets the terminal b to "H" as shown in FIG.

Similarly, 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".

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. and,
When operation switch S ₃ is pressed, terminal c becomes “H”,
When operating switch _S4 is pressed, terminal d becomes "H".

Further, 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, the respective side indicator lamps 46 and 47 are lit with that signal. It's getting old.

Furthermore, by combining the play operation signal from the tape recorder main body and the reference signal from the multivibrator 50, the E
Controls point and F point, always lights up in play mode,
The standby status can also be confirmed by blinking the other operating points.

In this way, no matter which way you load the cassette tape, if you specify side A, side A will be recorded and played, and if you specify side B, side B will be recorded.
The screen will be recorded and played back. 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. Ru. 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.

Regarding fast forwarding and rewinding, although it was not possible to correspond to the tape side in the conventional method, this embodiment makes it possible to do so.

In other words, attach it so that side A is the front side,
When side A 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,
If side B is specified, the fast forward signal will be rewinded (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. is,
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 and rewinding operations for the designated side are performed.

Further, in the above embodiment, by storing the operation in memory, the previous operation can be continued when the power is turned on again. Further, although a theoretical circuit is used in this embodiment, the same effect can be obtained by using a mechanical switch such as a relay.

As explained above, with this invention, it has become possible to directly specify the recording and playback sides of a cassette tape recorder equipped with an auto-reversing device, so there is no need to check the tape side before loading the tape, and it is also possible to Since it becomes much easier to respond, it becomes easier to select songs during playback, and the possibility of erroneous recording operations during recording is significantly reduced.

Furthermore, with a single switch operation, you can specify the side of the tape to be played or recorded and issue a command to start playback or recording at the same time, making it extremely easy to operate. Since there is no need to separately provide a place switch for starting the process, there is also the effect of reducing costs.

[Brief explanation of drawings]

Figures 1a and b are plan views of side A and side B of a typical cassette tape, respectively, and Figure 2 is a view of the cassette tape installed in a tape recorder showing an embodiment of the present invention. A cutaway perspective view, and FIG. 3 is an enlarged side view of the tape side detection mechanism.
4 and 5 are enlarged side views and configuration diagrams respectively showing other different examples of the tape side detection means in the present invention, and FIG. 6 is a circuit diagram showing an example of the control circuit in the embodiment of the present invention. , 7th
Figures 1 to 2 are timing chart diagrams showing the relationship of signal waveforms of various parts to explain the circuit of Figure 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, 46, 47... Display lamp, _S1 to _S4 ... Operation switch.

Claims (1)

[Scope of Claims] 1. Tape side detection means for detecting the tape side of a loaded cassette tape based on the presence or absence of screw holes or assembly screws in the cassette half surface of the cassette half, and one tape side of the cassette tape. a first switch that specifies the other tape side of the cassette tape; a second switch that specifies the other tape side of the cassette tape; and a second switch that specifies the other tape side of the cassette tape;
a control circuit for switching an auto-reverse system control signal; and a circuit for generating a play signal for starting playback or recording when the first or second switch is operated; An auto-reverse device characterized in that, by operating a switch, the side of the tape to be played or recorded on the cassette tape can be directly specified regardless of the installed state of the cassette tape, and at the same time, the playback or recording of the specified tape side is started. Cassette tape recorder with device.