JPH021702Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a cassette tape recorder capable of bidirectional recording and playback whose tape running direction is controlled by a control device.

In general, the method of operating a cassette tape recorder is to first visually determine the front and back sides of the cassette tape, and then to make sure that the desired side is played or recorded (hereinafter both are collectively referred to as "playing"). Attach the cassette tape to the main unit. Next, the player is operated to rewind to the beginning of the performance surface, and then the performance begins.

On the other hand, when a tape that has been recorded is to be played, the user selects a desired song in correspondence with the list of songs recorded on the tape. Generally, the track list is divided into side A (front) and side B (back), and the tracks are listed in order from the first track on each side.

However, with conventional general cassette tape recorders, as mentioned above, the operation is not performed automatically according to the playing surface, but the user has to adjust the operation based on the mounting direction of the cassette tape and the running direction of the tape recorder. This was extremely inconvenient, as it required cumbersome operations such as determining the performance, taking that into consideration, and repeatedly rewinding and fast forwarding to select a song.

This invention was made in view of the above points, and in a cassette tape recorder capable of bidirectional recording and playback, by having the tape recorder determine the mounting state of the cassette tape, it is possible to perform A To provide a cassette tape recorder capable of automatically rewinding or fast-forwarding to the first part of a specified performance side such as side or B side, and then starting recording, playback, or song selection. It is.

To this end, the cassette tape recorder according to this invention includes a front/back detection device for detecting the front and back sides of the loaded cassette tape, a performance surface designation device for designating the performance surface, and a designation signal from the performance surface designation device and the front/back detection device. Depending on the detection signal from the device,
A forward/reverse switching device that switches an input signal to a control device that controls the tape running direction so that the tape starts running for recording, playback, or song selection after rewinding or fast forwarding to the first part of the specified performance surface. It is equipped with

Hereinafter, embodiments of this invention will be described with reference to the accompanying drawings.

FIG. 1 is a block circuit diagram showing one embodiment of this invention.

In the figure, numeral 1 is a cassette tape installed in a tape recorder, and on one side of the case there is, for example, a light reflector as a member to be detected 1a for identifying the front and back (side A, side B). It is pasted. Then, the hubs 1b and 1c on which the tape is wound
A hub rotating shaft (reel shaft) 2a, 2b on the tape recorder side is fitted into these, respectively.

A drive device 3 (the hub rotation shaft 2b side is omitted) is attached to each hub rotation shaft 2a, 2b, and one hub rotation shaft 2a is provided with a rotation detection device 4 for detecting the rotation thereof. .

For example, as shown in the figure, the rotation detection device 4 includes a disk 4a that is fixed to the hub rotating shaft 2a and rotates therewith, and has an uneven periphery, and is arranged so that the uneven peripheral portion of the disk 4a is sandwiched between magnetic poles. When the disc 4a rotates, voltage fluctuations induced in a coil wound around the magnet 4b are utilized. The output of this rotation detection device 4 is input to the detection circuit 5, and the hub rotation shaft 2
When rotation of a stops, the output signal from the detection circuit 5 changes from low level "L" to high level "H".

Further, as the front/back detection device 6 for detecting the mounting state of the cassette tape 1, for example, a reflective photo sensor is used to detect the detected member 1a when the cassette tape 1 is mounted.
The mounting state of the cassette tape 1 can be identified from the detection signal. This detection signal is input to the judgment circuit 7.

When the detected member 1a is a light reflector, the front and back detection device 6 is a reflective photo sensor, and detects the front and back sides of the cassette tape based on the difference in the amount of reflected light depending on the presence or absence of the light reflector. 1a may be a recess, a conductive member, a magnetized body, etc., and accordingly, the front/back detection device 6 may also include a switch having an operating protrusion that can fit into the recess, an electrode piece that can be short-circuited by a conductive member, or a magnetic It can be a sensor etc.

Note that most of the commercially available cassette tapes have holes for embedding the heads of screws used to assemble two cassette halves only on one cassette half side, so it is important to note that the presence or absence of this hole or the screw The front and back sides of the cassette tape may be identified by detecting the presence or absence of the head.

In addition to the detection signal from the front/back detection device 6, a performance surface designation signal from the performance surface designation device 8 is also input to the determination circuit 7. The performance surface specifying device 8 includes a switch _S1 for specifying side A and a switch _S2 for specifying side B.
It consists of.

Based on the performance surface designation signal from the performance surface designation device 8 by turning on either switch S ₁ or S ₂ and the detection signal from the front/back detection device 6, the determination circuit 7
Accordingly, if the designated playing surface is in the opposite direction to the normal running direction, an error signal E is output. . The error signal E
This turns on transistor _Q1 and turns on the relay.
RL is energized, and its switching contacts S ₃ and S ₄ are switched. Note that when the designated performance surface is the same as the normal running direction, error signal E will not be output.
Relay RL is de-energized and its switching contacts S ₃ and S ₄ are in the state shown.

That is, this judgment circuit 7, transistor Q ₁ ,
and relay RL constitute a forward/reverse switching device that switches the signal input to the control device 10 that controls the tape running direction of the tape recorder.

Then, a performance start device 9 consisting of a switch _S5 for specifying the start of a performance controls a fast forward control device 10 via a switching contact _S4 of this forward/reverse switching device.
The signal is input to the FF or rewind REW terminal.

Further, when the hub rotating shaft 2a stops, the output of the detection circuit 5 changes from low level "L" to high level "H". This rising edge connects capacitor _C1 and resistor
The pulse signal differentiated with respect to _R1 is inputted via the switching contact _S3 to an input terminal for selecting the playing direction of the control device 10, that is, forward direction (FWG) or reverse direction (REV) running.

Note that the stop pulse generation circuit 11 generates a stop signal after the tape has stopped running, that is, the detection circuit 5
The aforementioned differential pulse generated by the output of is input to the control device 10, and the device generates a stop pulse only when the stopped state continues longer than the time until the traveling mechanism starts operating again. , its output is input to the stop (STOP) terminal of the control device 10.

The output group OUT of the control device 10 controls the running mechanism of the tape recorder.

Now, when cassette tape 1 is loaded into a tape recorder and, for example, side A is to be played in its normal running direction, if side A is designated to be played, the forward/reverse switching device will not operate and the switch S will be turned off. The switching states of ₃ and _S4 are as shown in the figure.
The signal generated by the control device 10
The signal is input to the REW terminal, and the A side of the cassette tape 1 is rewound in the initial direction.

When the tape is rewound to the beginning, the rotation of the hub rotating shaft 2a stops, and the output of the detection circuit 5 becomes high level "H", and the differential pulse is controlled via the switching contact _S3. An input is made to the FWD terminal of the device 10, and performance running in the normal direction is started.

When the end of the tape is reached in this state, the detection circuit 5 generates a tape stop detection output again.
The differential pulse is the FWD of the control device 10.
Even if an input is made to the terminal, the stop state continues, and a stop pulse is generated from the stop pulse generation circuit 11 and input to the STOP terminal of the control device 10, so that the tape recorder stops operating.

However, if the output of this stop pulse generation circuit 11 is used again as a performance start signal, continuous performance of side A is possible, and the output of stop pulse generation circuit 11 is used as a side B designation signal and a performance start signal. In this way, you can continue playing side B after playing side A.

In addition, when the cassette tape 1 is loaded so that the B side is played in the normal running direction and the B side is specified to be played, the tape recorder's running process is exactly the same as in the above case. After fast forwarding to the first part of side B, the performance begins.

On the other hand, when the device is mounted so that side A is played in the normal running direction and side B is specified to be played, an error signal E is sent from the judgment circuit 7 constituting the forward/reverse switching device.
occurs, relay RL ₁ is activated and switching contacts S ₃ and S ₄
is switched to the opposite side as shown.

Therefore, the signal from the performance start device 9 is input to the FF terminal of the control device 10, and fast forwarding is performed in the direction of the beginning of side B. Then, the stop signal from the detection circuit 5 is sent to the control device 10.
input to the REV terminal, and the performance starts running in the opposite direction from the beginning of the tape.

The same applies when the cassette tape 1 is loaded so that the B side is played in the normal running direction and the A side is designated to be played.

As explained above, according to this embodiment,
No matter what the front or back of the cassette tape and the state of the tape are when it is installed, it is possible to play from the beginning of the designated performance surface, and correspondence with the program list becomes extremely easy.

FIG. 2 is a circuit diagram showing a specific example of the judgment circuit 7 in FIG. 1, and FIGS. 3A to 3E are time charts showing the operation of FIG. The signal waveforms at each writing position are shown.

In FIG. 2, _S6 is a switch that is turned off when the cassette tape is loaded so that side A is played, and turned on when the tape is reversed, and corresponds to the front/back detection device 6 in FIG.

Switches S ₁ and S ₂ of the playing surface specifying device 8 and switch S ₆ of the front/back detection device 6 are connected in series with resistors R ₃ , R ₄ , and R ₅ , respectively, between the DC power supply V+ and the ground, so that each When switches S ₁ , S ₂ , and S ₆ are off, the levels of signals A, B, and C at the connection points between each resistor and the switch are “H”, and each switch S ₁ , S ₂ , and S ₆ is on. At this time, the levels of signals A, B, and C become "L".

Signals A and B generated by switches S ₁ and S ₂ of the performance surface specifying device 8 are input to the set input terminal S and reset input terminal R of a flip-flop circuit (hereinafter abbreviated as "FF") 13, respectively, and the FF1
3, signal A or B is held.

The output D held by FF13 is an exclusive OR circuit (hereinafter abbreviated as "EXOR") 1
Input to one input terminal of 4. This EXOR1
4 is input to the other input terminal. this
EXOR14 inputs signal C to the other input terminal, and when C=D, output E is low level “L”
When C≠D, the output is set to a high level "H" and a signal E is output for determining the loading state of the cassette tape from the two input signals C and D.

In the example shown in FIG. 1, rotation detection of the hub rotating shaft 2a is used as a means for detecting the first portion of the tape, but the invention is not limited to this, and for example,
Means for photoelectrically detecting portions of the leader tape may also be used. In that case, as shown in FIG. 4, photoelectric detectors 16a, 16 such as reflective photo sensors
b is installed near both ends of the tape exposed part of the cassette half, and when the tape runs in the direction of arrows P and Q, the recording/playback head 1
a photoelectric detector 16a in a position preceding 5;
By switching and using 16b, no matter when detecting the first part of either side A or B,
Early detection can be done.

FIG. 5 is a block diagram showing another embodiment of this invention, in which the control device 10 has a number-of-music designation device and a function of selecting music by detecting unrecorded portions between songs. This is an example of applying this idea to a tape recorder.

The output of the detection circuit 5 is directly connected to the control device 10.
is input to the music selection start SS terminal of the music selection device 1.
This is the same as the example shown in FIG. 1, except that the output of No. 7 is newly input to the control device 10.
Some parts are omitted.

In this case, it is slightly different from the embodiment shown in FIG. It is possible to start playing, fast-forward to the beginning of the specified song, and then start playing. In this case, it is possible to specify, for example, "A-3rd song," so the specification operation is very similar to the song list, making the specification clear and easy, and helps prevent erroneous operations.

FIG. 6 is a block diagram showing still another embodiment of this invention, and only the parts different from the example of FIG. 1 are shown.

In this example, the outputs of switches S ₁ and S ₂ of the performance surface specifying device 8 are respectively used as two inputs of the OR circuit 18, and when either side A or B is specified, that is, the output of the switch S ₁ or the switch S ₂ is No matter which one of them is turned on, the output of the OR circuit 18 is set to a high level "H", and this output is used as a performance start signal.

The output of the OR circuit 18 is inputted to the FF terminal or REW terminal of the control device 10 via the relay RL switching contact S ₄ forming a forward/reverse switching device, and the switch is activated.
Since the performance start signal is input at the same time as the surface designation operation by _S1 or _S2 , the performance start device 9, that is, the switch _S5 in FIG. 1 can be omitted.

As described above, according to this invention, it is possible to arbitrarily specify the performance surface and perform the performance regardless of the state in which the cassette tape is installed, and thereby the program specification corresponds to the program list. This prevents erroneous operations.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of this invention, FIG. 2 is a circuit diagram showing a specific example of the judgment circuit in FIG. 1, and FIG. 3 is a time chart showing the operation of the circuit in FIG. Figure 4 is a layout diagram showing the relationship between the recording/playback head and two photoelectric detectors;
FIG. 5 is a block diagram showing another embodiment of this invention, and FIG. 6 is a block diagram showing still another embodiment of this invention. 1...Cassette tape, 1a...Detected member,
4... Rotation detection device, 6... Front/back detection device, 7...
...Judgment circuit, 8... Performance surface designation device, 9... Performance start device, 10... Control device, RL...
relay.

Claims (1)

[Claims for Utility Model Registration] 1. A cassette tape recorder capable of bidirectional recording and playback in which the tape running direction is controlled by a control device, including a front/back detection device for detecting the front and back sides of a loaded cassette tape, and specifying a playing surface. a performance surface designation device for rewinding or fast forwarding to the beginning of the designated performance surface according to a detection signal from the front/back detection device and a performance surface designation signal from the performance surface designation device;
A cassette tape recorder comprising a forward/reverse switching device for switching a signal input to the control device so as to start tape running for playback or song selection. 2. A device in which the forward/reverse switching device generates an error signal when the normal running direction and the specified playing surface do not match, and switches the signal input to the control device based on the error signal to reverse the tape running direction. A cassette tape recorder according to claim 1 of the utility model registration claim.