JPS586222B2 - tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder that allows the amount of magnetic tape to be accurately determined.

Conventionally, a common method for displaying the amount of magnetic tape transfer is to drive a tape counter in conjunction with the rotation of a tape reel.

However, in this case, since the amount of tape transport is detected indirectly through the rotation of the reel, the number of rotations of the reel changes as the tape winding diameter changes, so the amount of tape transport is directly detected. There are some drawbacks that cannot be displayed.

Therefore, in order to avoid this drawback, there is a method in which a roller is provided that is in contact with the tape and rotates as the tape runs, and the rotation of this roller drives a tape counter to display the amount of tape transported. .

In this case, the amount of tape transport can be displayed linearly.

However, in cassette-type or magazine-type tape recorders, there is no space to install the rollers as described above.
Further, when the tape is rewound or fast-forwarded, there is a drawback that the rollers may slip or the rotation of the rollers may not match the amount of tape transport due to the inertia of the rollers.

Furthermore, for the same purpose, a dedicated track for recording position signals is provided on the surface of the magnetic layer of the magnetic tape, and a tape counter is driven by the playback signal from this track. This means that the number of tracks for recording information signals such as music will be reduced.

Furthermore, in this method, the position signal magnetic head must be kept in close contact with the tape even during fast forwarding and rewinding, which is practically impossible.

In view of these points, the present invention records a position signal without sacrificing a track for information signals or shifting the position of the track as described above, and can linearly display the amount of tape movement. This is how it was done.

That is, the present invention provides a magnetic head for reproducing information signals recorded on tracks provided in the longitudinal direction of the magnetic tape on the surface side of the magnetic layer of the magnetic tape, and a magnetic head for reproducing information signals recorded on tracks provided on the surface side of the magnetic layer of the magnetic tape in the width direction of the magnetic tape. In addition, in order to reproduce position signals recorded at a recording depth that hardly affects the tracks on which information signals are recorded, a magnetic head for position signal reproduction that is in contact with the side surface of the magnetic layer of the magnetic tape and a tape counter are provided. The position signal recorded on the side surface of the magnetic layer of the magnetic tape is reproduced by a position signal reproducing magnetic head and supplied to a tape counter for driving.

An embodiment of the present invention will be described below with reference to the drawings. First, in the present invention, a position signal magnetic head (hereinafter referred to as an edge head) is used for recording and reproducing position signals without sacrificing tracks of information signals. ) 3 will be explained.

That is, as shown in FIG. 1, a position signal is recorded in the width W direction of the tape 1 from the side surface 2a or 2b of the tape magnetic layer 1a of the magnetic tape 1 by the edge head 3, and the position signal is reproduced. Eggplant.

The magnetic air gap or gap 3a of the edge head 3 is connected to the side surface 2a.
or 2b.

In FIG. 1, reference numeral 1b indicates a base coated with a magnetic layer 1a, and reference numeral 4 indicates a magnetic surface with which a head and the like for recording and reproducing information signals come into contact.

Next, the tape running system of this tape recorder will be described.

In Fig. 2, 5a is an erasing head, 5b is a recording head,
5c is a playback head, 6 is a gap stan, 7 is a vinyl roller, and 8A and 8B are tape guides.

In this example, the edge head 3 for recording and reproducing position signals is attached to the tape guide 8B.

FIG. 3 shows an example of this tape guide 8B, which consists of a columnar body 11, flanges 12a provided at both upper and lower ends thereof,
12b, therefore, the tape 1 has a flange 12a.
, 12b on the outer periphery of the columnar body 11, and is transported in the direction of arrow a in a wound state as shown in the figure.

The edge head 3 is attached so that the gap 3a of the edge head 3 faces a part of the surface 13 of the lower flange 12b.

That is, as shown in FIGS. 3 to 6, the gap 3a of the edge head 3 is selected so as to be approximately perpendicular to the longitudinal direction of the tape 1, and the tape 1 is positioned so that the tape 1 is located exactly in the center of the gap 3a. The relative positional relationship between the edge head 3 and the edge head 3 is selected.

Note that the edge head 3 is normally attached to the side surface 2 of the tape 1.
A notch 17 matching the shape of the head casing 16 is formed in the flange 12b in order to make sliding contact with the head casing 16.

Further, a recording/reproducing system for supplying position signals to the edge head 3 as described above and for extracting recorded position signals will be explained with reference to FIG.

In FIG. 7, 21 is a pulse generator that generates a pulse signal of a predetermined frequency, and the output terminal of this pulse generator 21 is connected to the edge head 3 through an amplifier 22.

A tape counter 20 is composed of a reversible counter 25, a decoder 26, and a display 27.

The connection point between this amplifier 22 and the edge head 3 is connected to the amplifier 2
3 to the movable contact of the changeover switch 24, the first fixed contact of the changeover switch 24 to the addition input terminal 25a of the reversible counter 25, and the second fixed contact of the changeover switch 24 to the subtraction input terminal of the counter 25. 25b, and the output terminal of the counter 25 is connected to the display 27 through the decoder 26.

This display 27 is a digital display using a Nixie tube, a light emitting diode, a liquid crystal display element, etc.

Note that 25c is a reset terminal of the counter 25.

Further, 28 is an input terminal for an information signal, and this input terminal 28 is connected to the recording head 5b through an amplifier 29.

Furthermore, the playback head 5C is connected to an output terminal 31 through an amplifier 30.
Connect to.

In the circuit shown in FIG. 7, when recording an information signal, the information signal supplied to the input terminal 28 is sent to the recording head 5b.
is supplied to record on the surface 4 of the magnetic layer 1a of the tape 1.

Further, a pulse signal from the pulse generator 21 is supplied to the edge head 3 and recorded on the side surface 2a of the magnetic layer 1a of the tape 1.

Therefore, position signals are recorded on the side surface 2a of the tape 1 at predetermined intervals, and at the same time, these pulse signals are recorded on the side surface 2a of the tape 1.
5 and is counted, and the contents of this count are displayed on the display 27.

Further, when reproducing information signals from the tape 1 recorded as described above, the reproduced information signals from the reproducing head 5c are outputted to the output terminal 30.

In addition, the position signal reproduced by the edge head 3 is sent to the counter 2.
5 and displayed on the display 27.

Furthermore, when performing fast forwarding or rewinding, the edge head 3 reproduces the position signal, supplies it to the counter 25, and displays it on the display 27.

According to the tape recorder of the present invention described above, position signals recorded at predetermined intervals on the side surface 2a of the magnetic layer 1a of the tape 1 during recording are counted and displayed during playback, fast forwarding, and rewinding, so that the tape 1 is moved Quantities can be displayed linearly.

In this case, during rewinding and reverse running, the movable contact of the changeover switch 24 is connected to the subtraction input terminal 25 of the counter 25.
Connect it to side b.

Further, when recording a position signal, a recording depth of about 0.15 mm is sufficient for practical use.

Furthermore, the position signal uses an extremely low frequency of about 10 Hz, so spacing loss is not much of a problem in the case of such a low frequency signal, so even if the side surface 2b of the magnetic layer 1a is not flat, Alternatively, even if the tape 1 is somewhat undulating, even during fast forwarding and rewinding, good recording and reproduction can always be performed.

Therefore, if a reset signal is supplied to the reset terminal 25c at a predetermined position on the tape 1, for example, at the starting end of the tape 1, the count content of the counter 25 is set to zero, and the following operations are performed, the display always shows the tape 1. It corresponds to any position of the information signal, and is extremely convenient for use in cueing information signals, editing, etc.

Furthermore, since the position signal can be recorded without changing the recording track on the surface 4 of the magnetic layer 1a of the tape 1 on which the information signal is recorded, there is no problem in tape compatibility.

Note that the edge head 3 does not need to be provided in conjunction with the tape guide as in the above-described embodiments, and can be placed and used at any position within the tape running system.

Further, the reset signal supplied to the reset terminal 25c may be connected to a so-called auto-shutoff circuit of the tape recorder so that the reset signal is supplied when the tape recorder is shut off.

Furthermore, in long tapes such as so-called C-120,
The small indicator 27 can be adjusted by adjusting the number of position signals generated by the pulse generator 21 or by inserting a suitable frequency divider in front of the counter 25 to reduce the number of position signals at an arbitrary rate. can be displayed for a long time.

Furthermore, when performing stereo recording on a model with a narrow tape width, such as a cassette tape recorder, there is a possibility that crosstalk may occur between the information signal recording track and the position signal recording track. In this case, for example, the recording tracks of the right and left channels of the information signal in the same direction should be aligned, the Ganode band between the recording tracks of the right and left channels should be narrowed, and the recording rack of the information signal should be separated from the side of the tape. Just do it.

Further, the tape recorder according to the present invention is of an open reel type,
It can be applied to all types of tape recorders such as cassette type and magazine type.

In addition to the above-described embodiments, a drum-type mechanical counter may be used as the tape counter, and in that case, the tape counter may be driven by a pulse motor.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the principle of the magnetic head of the present invention, Fig. 2 is a plan view illustrating the running system of the tape recorder according to the present invention, and Fig. 3 is a diagram of a tape guide to which a position signal edge head is attached. A perspective view showing an example, FIG. 4 is a plan view thereof, FIG. 5 is a partial sectional view thereof, FIG. 6 is a side view of FIG. 5,
FIG. 7 is a connection diagram of a position signal recording/reproducing system according to the present invention. 1 is a tape, 1a is a magnetic layer, 2a and 2b are its side surfaces, 3
is an edge head as a magnetic head for recording and reproducing position signals; 3a is its gap; 5b is a recording head; 5c is a playback head; 8A and 8B are tape guides; 12a and 12
b is a flange, 17 is a notch, 20 is a tape counter, 2
1 is a pulse generator, 22, 23, 29 and 30 are amplifiers, 2) 4 is a changeover switch, 25 is a reversible counter, 26 is a decoder, 27 is a display, 28 is an input terminal for information signals, 3 and j are This is its output terminal.

Claims (1)

[Claims] 1. A magnetic head for reproducing information signals recorded in tracks provided in the longitudinal direction of the magnetic tape on the surface side of the magnetic layer of the magnetic tape, and a magnetic head provided on the side surface of the magnetic layer of the magnetic tape in the width direction of the magnetic tape. a magnetic head for reproducing position signals that is in contact with a side surface of the magnetic layer of the magnetic tape, and a tape counter for reproducing position signals recorded at a recording depth that has almost no effect on tracks on which information signals are recorded; The tape counter is characterized in that the position signal recorded on the side surface of the magnetic layer of the magnetic tape is reproduced by the position signal reproducing magnetic head and supplied to the tape counter for driving. Tape recorder.