JPS5824277Y2 - magnetic recording and reproducing device - Google Patents

Description

[Detailed description of the invention] The present invention is capable of both recording and reproducing by running a magnetic tape in the forward direction, and at least reproducing by running the magnetic tape in the reverse direction. The present invention relates to a traveling type magnetic recording/reproducing device.

In general, reel-to-reel type magnetic recording and reproducing devices can be broadly divided into two-track, two-channel type first devices that can only perform recording and playback by running the magnetic tape in the forward rotation direction; A second device of 4-track 2-channel type, which has a recording/playback function of running the magnetic tape in the forward direction and a function of running the magnetic tape in the reverse direction and performing only playback, is the basis of the present application as described above. It can be divided into three types: a third device is a 4-track, 2-channel system capable of reciprocating recording and playback;

Each of these three types of devices is equipped with a dedicated head block.

In other words, as shown in FIG. 1, the first device is equipped with a first head flock A that is constructed by connecting three heads: an erasing head 1a for forward rotation, a recording head 2a, and a playback head 3a. , the magnetic tape 4 is run in the normal rotation direction 5 and the magnetic tape 4 is rotated in the first direction. Recording can be simultaneously performed on both second tracks 4a and 4b, and this can be played back.

In addition, in the case of the second device described above, as shown in FIG. The head block B is provided with a head block B that runs the magnetic tape 4 in the normal rotation direction 5 and rotates the magnetic tape 4 in the forward rotation direction 5. 3rd both trucks 4
In addition to simultaneously recording and reproducing the magnetic tape 4f at 1°43, the magnetic tape 4f is run in the reversal direction 7 and the 2nd. The signals recorded on both fourth tracks 42 and 44 can be played back.

Furthermore, in the case of the third device, as shown in FIG.
In addition, it is provided with a third head block C configured by connecting six heads: an erasing head 8 for reversing, a recording head 9, and a reproducing head 10, and runs the magnetic tape 4 in the normal rotation direction 5. 1. In addition to simultaneously recording and reproducing the third tracks 41 and 43, the magnetic tape 4 is run in the reverse direction 7, and the second track 41 and 43 are simultaneously recorded. Both fourth tracks 42 and 44 can be simultaneously recorded and played back.

As is clear from the explanation in Section 1, the third device has the functions of the first device and the second device, so the third head block is the same as the first device. By replacing it with the second head block, the third device can be converted into the first device and the second device.

For example, the third device is a 4-track, 2-channel system, so if you want to use it as a 2-track, 2-channel system, that is, if you want to change the track, or if you want to change the track, the third device can be used for 6 heads and other devices. For example, if the user thinks that the number of heads is too large and the performance of the heads is not being obtained sufficiently, and wants to use 4 heads or 3 heads, for example, the user may not be able to record in the reverse direction. If you want to replace the head block with a 4-head second head block to prevent the head from getting dirty because it is rarely used, you can achieve that goal by replacing the head block of the third device.

However, since the third device is originally capable of recording and playing in both forward and reverse tape running directions, for example, when the first head block is attached to the third device, This first head block does not have a reversing head, so it is impossible to perform reverse recording or playback.However, by performing a reverse recording or reversing playback operation, the tape runs in the reverse direction, recording and playing. The amplifier starts working.

Therefore, even if the user thinks that the tape is recording in reverse, no signals are actually recorded on the tape, so important recordings may be missed, or harsh noises may be produced during reverse playback. Various harmful effects may occur.

This also applies when a second head block is attached to the 53rd device, and even though reverse recording is not possible, reverse recording is possible, so you will miss out on important recordings. .

Therefore, the present invention aims to prevent the occurrence of such problems. For example, when the first head block is attached to the third device or the second device, the third device or the second device The purpose of this is to switch the first device so that it can only perform the function of the first device.

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

In FIG. 4, 11 is a forward rotation constant speed running command switch for running the magnetic tape at a constant speed in the forward rotation direction; 12 is a reverse constant speed running command switch for running the magnetic tape at a constant speed in the reverse direction; 13 is a recording deletion command switch for recording.

Fl is a first memory circuit that is set by closing the forward constant speed running command switch 11, F2 is a second memory circuit that is set by closing the reverse constant speed command switch 12, and F3 is the recording circuit that is set by closing the reverse constant speed command switch 12. This is a third memory circuit that is set by closing the erase command switch 13, and these memory circuits F1 to F3 are constructed of flip-flop circuits consisting of NAND gates.

The operation of these memory circuits F1 to F3 is such that when a low level signal (L signal) is supplied to the set terminal S, the first . Second output terminal Q.

A high level signal (H signal) and an L signal are output to the Q terminals, respectively, and when the L signal is supplied to the reset terminal R1t and R2, the first . The second output terminals Q and Q each have an L signal,
While the H signal is output and the L signal is simultaneously supplied to the set terminal S and the reset terminal Rtt and R2, the 1st. Both second output terminals Q and Q operate so that an H signal is output.

Therefore, when the forward rotation constant speed running command switch 11 is turned on, the first memory circuit F1 is set, and when the reverse constant speed running command switch 12 is turned on, the second memory circuit F2 is set, and the above switch 11 and the recording deletion command switch are set. 13 or when the switch 12 and the recording erase command switch 13 are turned on at the same time, the set terminal S of the third storage circuit F3 goes to L level via the diode 14, 15, so the third storage circuit F3 is set.

Reference numeral 16 indicates a forward rotation constant speed running drive circuit and mechanism (including recording and playback amplifiers) which is activated by the set output of the first memory circuit F1, and 17 which is activated by the set output of the second memory circuit F2. Inversion constant speed traveling drive circuit and mechanism (including recording and reproducing amplifiers) 18 is a recording erasing circuit activated by the set output of the third storage circuit F3.

Reference numeral 19 denotes a head block detection section, which is composed of a connector jack fixed to the main body 28 of the device as shown in FIG.
It has three terminals 20, 21, and 22, and the first
The head block A (consisting of recording, playback, and erasing heads for normal rotation as shown in Figure 1) is located in the main body 2 of the device.
8, the detected part A' (as shown in FIG.
The terminals 20a, 21a, 22a of the head board 29 are connected to the terminals 20, 21, 22 of the detecting section 19.

Furthermore, when the second head block B (as shown in Fig. 2, consists of recording, playback, and erasing heads for forward rotation and a playback head for reverse rotation) is installed, this second head block Terminals 20b and 21 of the detected part provided in block B
b and 22c are connected to the terminals 20 to 22 of the detection section 19, and the terminals 20 and 22 are short-circuited.

Furthermore, when the third head block C (as shown in Fig. 3, consists of normal rotation, reverse rotation, recording/playback, and erasing heads) is installed, the cover provided on this third head block C The terminals 20c, 21c, 22c of the detection section C' are connected to the terminals 20 to 22 of the detection section 19, and the terminals 20.about.21.
22 is shorted.

Among the three terminals constituting the detected section 19, the terminal 20 is
The base of the transistor 24 and the resistor 25 are connected to the power supply CC, and the terminal 21 is connected to the base of the transistor 26 and the resistor 27 to the first output terminal Q of the second memory circuit F2.

Further, the collector of the transistor 24 is connected to the reset terminal R2 of the second memory circuit F2, and the collector of the transistor 26 is connected to the reset terminal R2 of the third memory circuit F3.
Connected to 1.

In the above embodiment, the operation will be explained next.
When head block A is installed, the first
Although the detected part A' of the head block A is connected, since the terminals 20 to 22 are open, the transistor 2
4 is on.

Furthermore, when the second memory circuit F2 is not set, the first output terminal Q of the second memory circuit F2 is at L level, so the transistor 26 is off.

In this state, when the normal rotation constant speed running command switch 11 is turned on, the first memory circuit F1 is set, and when this switch 11 and the recording deletion command switch 13 are turned on, the third memory circuit F3 is also set.

In other words, it becomes a normal rotation recording or normal rotation playback state.

However, since the transistor 24 is on, the reset terminal of the second memory circuit F2 is at L level, so even if the inverted constant speed running command switch 12 is turned on, the second memory circuit F2 is not set.

Also, if switches 12 and 13 are turned on at the same time, switch 1
2 is turned on, the first output terminal Q of the second memory circuit F2 is at H level and the transistor 26 is turned on/off, so that the set terminal S and reset terminal R1 of the third memory circuit F3 are turned on.
Since both are at L level, this third storage circuit F3 is not set.

In other words, it does not enter reverse recording or reverse playback.

Further, if the stop state is when all of the first to third memory circuits F1 to F3 are reset, then when the reverse constant speed running command switch 12 is turned on, the first to third memory circuits F1 to F3 are reset.
F3 is reset and enters the stop state.

Next, when the second head block Bk is attached, the detection section 19
Since the detected portion B' of the second head block B is connected to the terminal B, the terminals 20 and 22 are short-circuited.

The base emitter of transistor 24 is then closed,
The str/registor 24 is turned off.

In this state, the first and second memory circuits F e F 2 can be respectively set by the switches 11 and 12, and the third memory circuit F3 can be set by turning on the switches 11 and 13 at the same time.

However, if switches 12 and 13 are turned on at the same time, the second
The memory circuit F2 of is set and this second memory circuit F2
Since the first output terminal Q changes to H level, the transistor 26 turns on and the third storage circuit F3 is reset.

That is, recording and playback in forward rotation and playback in reverse rotation are possible, but the recording erasing circuit 18 cannot be operated during constant speed running in reverse rotation.

When the third head block C is attached to the sensor, the detection part 1
Since the detected portion C of the third head block C is connected to the terminal 9, the terminals 20, 21, and 22 are short-circuited.

Therefore, both transistors 24 and 26 are turned off.

In this state, the switches 11 and 12 are used to switch the first. Second memory circuit F1. F2 can be set respectively, and the third storage circuit F3 can be set by turning on switches 11 and 13 or 12 and 13 simultaneously.

In other words, recording and playback are possible in both forward and reverse rotation.

In the embodiment described above, when the first head block Af is installed, it disables the reverse constant speed running operation and at the same time disables the recording erasing operation, but since the reverse running of the tape itself is disabled, the recording erasing operation is disabled. You can enable it and press the button.

In addition, although the first to third head blocks A to C have separate heads for recording, playback, and erasing, it is possible to use a combination head to provide both recording and playback functions in one head, and to have an erasing function as well. It may also have the following properties.

Furthermore, in the embodiment described above, the detection of the head block is automatically performed by mounting the head block, but it is also possible to manually switch the switch when the head block is mounted to make the device correspond to the mounted head block.

Further, in the above embodiment, the first head block is for two tracks, and the second head block is for two tracks. Although the third head block is used for 4 tracks, it may be used for 1 track or 2 tracks.

As explained above, the magnetic recording/reproducing device of the present invention is capable of reciprocating the tape, and when it is desired to change the number of tracks on the tape from 4 tracks to 2 tracks, or from 2 tracks to 1 track, etc., the head block can be changed. When replacing with a device exclusively for forward rotation recording and playback, it disables reversing operation, making it clear to the user that there is no point in performing reversing operation, and also prevents electrical circuits such as amplifiers associated with reversing operation. This also stops the operation of the camera to prevent the generation of harsh noises.

Therefore, according to the present invention, by replacing the head block of a device with a reciprocating function, it is possible to manually or automatically perform only the functions corresponding to the head block, and not to perform functions that do not correspond to the head block. There are no errors and the device can be used correctly.

[Brief explanation of the drawing]

Figures 1 to 3 are diagrams explaining various types of head blocks;
FIG. 4 is a circuit diagram showing an embodiment of the present invention, and FIG. 5 is a front view showing a state in which the head block is attached. 11... Forward rotation constant speed running command switch, 12... Reverse constant speed running command switch, 13... Record erasing command switch, 16... Forward rotation constant speed running drive circuit and mechanism, 17.
... Reversing constant speed traveling drive circuit and mechanism, 18... Record erasing circuit, 24, 26... Transistor, A... First head block, B... Second head block,
C...Third head protrusion A'...First detected part, B'...Second detected part, C'...Third detected part, Fl... A first memory circuit, F2... a second memory circuit, F3... a third memory circuit.

Claims (2)

[Scope of utility model registration request] (1) A first storage circuit that is set by the operation of causing the magnetic tape to run at a constant speed in the forward rotation direction; a tape forward rotation constant speed running driving means that is activated by the set output of the first storage circuit; a second memory circuit that is set by the operation of running the tape at a constant speed in the reversing direction; a tape reversing constant speed drive means that is activated by the set output of the second memory circuit; and a second memory circuit that is set by the recording operation. 3 storage circuit, and a recording/erasing circuit activated by the set output of the third memory circuit, and the first head is composed of an erasing head for normal rotation, a recording head, and a playback head. A magnetic recording/reproducing device capable of selectively mounting a head, a recording head, a playback head, and a second head block consisting of at least a reversing playback head, wherein when the first head block is mounted, the above-mentioned A magnetic recording/reproducing device comprising a blocking circuit that makes it impossible to set a second storage circuit. (2) First. A mutually different first head block,
A second detected portion is provided, and head block detection means is provided for detecting the detected portion to determine the first head block, and when the first head flock is mounted, the detection means causes the blocking circuit to be activated. 2. A magnetic recording and reproducing apparatus according to claim 1, which automatically operates the following.