JPH04241213A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To miniaturize an entire magnetic recording and reproducing device and to lighten a load imposed on a tape in comparison with the conventional device where a fixed head is specifically added to a part of a traveling system, by providing the fixing head at the lower drum part of the rotating drum of the device. CONSTITUTION:Recording and reproducing is performed on a part other than a rotary magnetic head track by the fixed magnetic head 7e which is disposed at the part of the lower drum 7c of a rotating drum device in the magnetic recording and reproducing device. The entire device is miniaturized and the load imposed on the tape is reduced.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording and reproducing apparatus.

0002

2. Description of the Related Art Hitherto, helical scan type magnetic recording and reproducing apparatuses such as VTRs and RDATs have been used which record and reproduce information on magnetic tape using a rotating magnetic head. The track for the fixed head on the tape track pattern of this device is provided with a fixed head separate from the rotating head of the rotating drum device.
It was recording and playing back.

FIG. 7 is a diagram showing a track pattern of a conventional magnetic tape. In FIG. 7, 1 is a magnetic tape (hereinafter referred to as tape) for recording and reproducing signals, and 1a is a magnetic tape for recording and reproducing signals with a rotary head. Main tracks 1b and 1c are optional tracks on which recording and reproduction are performed using fixed heads.

FIG. 8 is a diagram showing a conventional tape guide layout. In FIG. 8, 1 is a magnetic tape, 2 is a supply reel on which the tape is wound and supplies the tape, 3 is a tape guide post that pulls out the tape to a predetermined format position, and 4 is a tension detection device that controls the tension of the tape. , 5 is a guide roller that guides the tape to a predetermined position, 6 is a slant pole for three-dimensionally running the tape, 7 is a rotating drum equipped with a rotating magnetic head for recording and reproducing on the track 1a (FIG. 7); 8 is a slant pole similar to slant pole 6, 9 is a guide roller 5
10 is a capstan that controls the feeding speed of the tape, 11 is a pinch roller that presses the tape against the capstan 10 and generates a feeding force, 12 is a tape guide post similar to tape guide post 3, 13 Reference numeral 14 indicates a take-up reel for winding the tape, and 14 a fixed magnetic head for recording and reproducing information on the track patterns 1b and 1c shown in FIG.

The recording and reproducing operation of this conventional magnetic tape is normally performed, so its explanation will be omitted.

[0006]

SUMMARY OF THE INVENTION As described above, in the conventional example, a separate fixed head was provided as a part of the tape running system. For this reason, it was disadvantageous to downsize the device.

[0007] Also, since the number of tape guides increases, the running load on the tape increases. Furthermore, it requires mounting adjustment of the fixed head and parts for mounting adjustment, which poses problems such as being disadvantageous in terms of cost.

The present invention was made to solve the above-mentioned problems, and a fixed head is provided in the lower drum portion of the rotating drum device, and the fixed head is separately attached to the traveling system as in the conventional example. The purpose is to make the entire device smaller and to reduce the load on the tape, compared to adding only a portion.

[0009]

[Means for Solving the Problems] Therefore, the present invention provides a rotating drum device having a rotating magnetic head, a magnetic tape that slides into contact with the rotating drum device at a predetermined angle, and a lower drum portion of the rotating drum device. a fixed head for recording and reproducing other than the rotating magnetic head track;
It is an object of the present invention to achieve the above-mentioned object by a magnetic recording and reproducing apparatus comprising the following.

0010

[Operation] In the magnetic recording and reproducing apparatus of the present invention, the magnetic tape is brought into contact with the rotating drum device at a predetermined angle, and the fixed head disposed in the lower drum portion of the rotating drum device records and reproduces the magnetic tape on a track other than the rotating magnetic head track. Reproduce.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Three embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of a rotating drum device according to a first embodiment of the present invention, FIG. 2 is a tape guide layout diagram of the first embodiment, and FIG. 3 is a diagram showing recording and recording with a fixed head of the first embodiment.
FIG. 4 is a block diagram showing the reproduced signal, and is a diagram showing the waveform and signal state of FIG. 3.

In FIG. 1, 7a is a rotating magnetic head 7b.
The rotating upper drum 7c is a lower drum equipped with a tape guide, and a notch 7d is provided in a part thereof, and a fixed magnetic head (hereinafter referred to as fixed head) 7e is disposed in that part. 7f is a drum motor for driving the rotating upper drum 7a.

In FIG. 2, the difference between the first embodiment and the conventional example is that the fixed head 14 in the conventional example is replaced by a drum 7c.
This is because the fixed magnetic head 7e is incorporated into the fixed magnetic head 7e, thereby eliminating the influence of the fixed head on the running system.

FIG. 3 shows recording/reproducing signals with the fixed head, and reference numeral 15 denotes a recording/reproducing amplifier (R
ec/Pb Amp. ), 16 is a coder/decoder for encoding and decoding 1 or 0 signals, 17
is a system controller that controls the entire system, and signals such as tape addresses are input/output to/from the fixed head 7e. Figure 4 shows the waveform and signal state at this time, the code is 17s in Figure 3, and the recorded signals are 15s and 16s.
, the reproduced signals are 15 seconds each, and the reproduced waveform shaping signals are processed by the coder/decoder 16. code 1
The signals 0 and 0 correspond to the duty of the rectangular wave, and in this embodiment, a large duty corresponds to 1 and a small duty corresponds to 0, and the duty is determined by the rising edge and falling edge of the recording or reproduction signal.

Next, FIG. 5 shows a second embodiment of the present invention.
Explain using. FIG. 5 is a layout diagram of a second embodiment of the invention.

In FIG. 5, the second embodiment differs from the first embodiment in that the fixed head 7e is moved closer to the take-up reel 13 by the lower drum 7c as shown. The rest of the structure is the same as that of the first embodiment. According to the second embodiment, in the DAT format, 8 mm video format, etc., the distance from the rotary head can be increased, so that head contact between the heads and the tape can be improved.

Next, FIG. 6 shows a third embodiment of the present invention.
Explain using. In FIG. 6, the difference between the third embodiment and the first embodiment is that the sliding contact is made by an amount α more than the angle 13 of the predetermined format of the first embodiment, and the fixed head 7e is disposed at the α portion. The rest of the configuration is the same as that of the first embodiment. According to the third embodiment, it is possible to improve the head contact between the rotary head and the fixed head with the tape.

[0019]

As explained above, in the present invention, a fixed head is provided in the lower drum portion of the rotating drum device, and the fixed head is separately added to a part of the traveling system as in the conventional example. In comparison, it has the effect of downsizing the entire device and reducing the load on the tape.

[0020]

[Brief explanation of the drawing]

FIG. 1 is a side view of a rotating drum device that is a first embodiment of the present invention.

[Figure 2] Tape guide layout diagram of the first embodiment

[Figure 3
]Block diagram showing recording/reproducing signals in the fixed head of the first embodiment

[Figure 4] Diagram showing waveforms and signal states in Figure 3

[Figure 5]
Layout diagram of the second embodiment of this invention

[Fig. 6] Layout diagram of the third embodiment of this invention

[Figure 7] Track pattern diagram of conventional magnetic tape

[Figure 8] Conventional tape guide layout diagram

[Explanation of symbols]

1 Magnetic tape 1a Main track 1b, 1c Optional track 2 Supply reel 3,12 Tape guide post 4 Tension post 5,9 Guide roller 6,8 Slant pole 7 Rotating drum 7a　Rotating upper drum 7b Rotating magnetic head 7c Lower drum 7d Notch 7e Fixed magnetic head 7f Drum motor 10 Capstan 11 Pinch roller 13 Take-up reel 14 Fixed magnetic head In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A rotating drum device having a rotating magnetic head; a magnetic tape that slides in contact with the rotating drum device at a predetermined angle; A magnetic recording and reproducing device comprising: a fixed head for reproducing.