JPS613307A - Magnetic recording device - Google Patents

Abstract

PURPOSE:To improve the use efficiency of reference tape generation by providing plural video heads at intervals of 180 deg. on the outer peripheral surface of a rotary drum and running a magnetic tape helically and applying video signals of the same picture simultaneously to them to form the same magnetized tracks simultaneously. CONSTITUTION:When NTSC signals are adopted as recording video signals, a rotary drum 29a is rotated uniformly in the direction of an arrow 22 with 30Hz, and the feeding speed of a magnetic tape 4 is set to the three-fold value of the normal speed, and a chrominance signal test pattern and a horizontal resolution test pattern are applied to the first video heads 30-32 and the second video heads 33-35, thereby forming magnetized tracks 11, A2, etc. It is possible that the horizontal synchronizing signals of video signals are recorded only during 0-262.5 horizontal periods by the first video heads 30-32 and the rest of the horizontal synchronizing signal is recorded by the second video heads 33-35. Thus, the recording time is shortened when video signals of the same picture are recorded to generate a reference tape, and the use efficiency of a reference tape generating device is improved.

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention is applicable to magnetic recording devices, especially l! ! l! The present invention relates to a device for creating reference data 7 used for magnetization track compatibility adjustment of a helical scan type magnetic recording/reproducing device for recording and reproducing e-signals. Conventional configuration and its problems Conventionally, this type of reference tape creation device has been used to precisely adjust the 1-1-blade travel path, etc. of a helical scan type magnetic recording/reproducing device (hereinafter referred to as a helical type VTR), which has relatively stable performance. and is used to create reference tapes. First, a conventional example will be explained with reference to the drawings. FIG. 1 is a plan view of the main part of a helical type VTR that mainly records and reproduces video signals, etc., and shows a portion of a magnetic tape 4 housed in a cassette case 1 and wound around a supply reel 2 and a take-up reel 3. The part is stretched over the tape guide 5.6 as shown in the broken part 17, and this is pulled out from the cassette case 1 by the tape loading means, and the tension post 8, V-pup guide 9, 10 rotation guide 11, erasing head 12, tape guide 13 , Wrap magnetic tape in a helical shape

[Rotary head device 14, tape guide 15, audio
A tape running path is formed via a hunt roll head 16, a capstan 17, a pinch roller 18, and a tape guide 19, leading to the winding, reel, and reel 3 of the force pit case 1. 20.21 is 1 on the outer periphery of the rotating drum of the rotating head device 14.
The video heads are mounted at 80° intervals and rotate in the direction of arrow 22. Reference numeral 23 denotes a video signal input terminal to which a desired video signal is applied from the outside, and the video signal is subjected to signal processing such as FM modulation in a video signal recording and amplification circuit 24, and is then applied to the video heads 20 and 21. When recording a video signal in a conventional helical type VTR configuration, the video signal is applied to the video signal input terminal 23, and an FM-modulated recording signal is supplied to the video head 20.21. is rotated at a predetermined speed in the direction of arrow 22, the kit bustan 17 is rotated at a constant speed, and the magnetic tape is rotated at a constant speed in the direction of arrow 25 by sandwiching the magnetic tape 4 between the knob stun 17 and the pinch roller 18. When the magnetization track 20' is moved as shown in FIG.
21' are sequentially formed on the magnetic tape 4. That is, the magnetized tracks 20' and 21' in FIG. 2 are formed when the video head 20, 21 rotates in the direction of arrow 22 and moves in the direction of arrow 26, respectively, on the surface of the magnetic arc 4, which is traveling at a constant speed in the direction of arrow 25. They are formed sequentially by scanning in a helical manner. Using the magnetized tracks 20' and 21' of the magnetic 7--G 4 recorded with the above configuration, a helical type V of the same specification is used.
It is possible to set the recording magnetization track of the TR at a predetermined position. The reason for this is that the helical type V T with the same specifications
For example, when a magnetic tape recorded on a first helical type VTR is played back on a second helical type VTR (generally, VTR compatible playback is required). If the video head scanning trajectories of the respective helical type VTRs are different from each other, as shown in FIG. On the other hand, the scanning trajectory of the playback video head of the second helical type VTR is
! 27.2B, resulting in a decrease in the output of a portion of the playback signal and a deterioration in the quality of the playback image.To prevent this, the scanning trajectory of the recording or playback video head between helical type VTRs of the same specifications. A common adjustment method is to reproduce the magnetic field to match the magnetization track locus of the standard 7-p during the manufacturing process so as to precisely match it. In creating this reference tape, we precisely adjusted the tape running path, etc. of a helical type VTR with the same specifications to minimize wow and flutter characteristics. It has been common practice to record video signals using the same vM image such as a scope pattern.
When creating a reference tape by recording a video signal of the same image such as a color par pattern for color signal testing and a monoscope pattern for underwater resolution 65 stroke using R to form a rack on magnetization 1, the second As shown in the figure, since the magnetic tracks 20' and 21' are sequentially formed one by one while the video heads 20 and 21 scan the surface of the magnetic data, the recording time becomes long (and it takes a long time to prepare the reference tape). If a large amount of standard tape is required, it may be necessary to install several sets of helical type VTRs with the same specifications. OBJECTS OF THE INVENTION The present invention is directed to a color bar pattern for color signal testing, a monoscope pattern for horizontal resolution testing, etc.
#Il by statue! It is an object of the present invention to provide a magnetic recording device that can shorten the recording time required when recording image signals to create a reference tape. Structure of the Invention The magnetic recording device of the present invention has a plurality of video heads arranged at predetermined intervals on the outer periphery of a rotary drum at a distance of 180 degrees, and a magnetic tape is helically guided on the outer peripheral surface of the rotary head device. It is characterized by simultaneously applying the same image (iQ) to a plurality of video heads while running the magnetic tape, thereby simultaneously forming a plurality of helical magnetizations of the magnetic tape. An example will be explained based on FIGS. 3 to 6. Components having the same function as those in FIG. This is the main part of the base #-j-p creating device according to the above, and first video heads 30, 31, and 32 capable of recording video signals are provided at positions 180 degrees apart on the outer periphery of the rotary head device 29. , a second video head 33, 34, 35 is provided on the opposite side and scans the surface of the magnetic tape 4 in a helical manner to form a magnetized track.First and second video heads 30-32, 33- 3
The output of the video signal recording amplification circuit 24 is connected to 5, and the video signal is recorded on the magnetic arc. Figure 4 shows the first and second video heads 30.
35, the first video head 30-3
2 each have a gap configured in the same direction azimuth in the center, and are attached at a predetermined interval n1 in the rotational direction of the arrow 22 and at a predetermined interval Q2 in the height direction. Further, the head width W in the direction perpendicular to the rotation of each of the first bi"y=A heads 30-32 is W-
1!2/2) relationship. Similarly, the second video heads 33.about.15 follow the positional relationship of the first video heads 30.about.32 as shown in the figure. Furthermore, the lower end surfaces of the first video head 30 and the second video head 33 are mounted at the same height as shown by the two-dot broken line 36)
FIG. 5 shows the rotating head device 29, and the rotating drum 29a
The first video heads 30 and -32 are attached to the lower end of the first video head A, and the second video heads 33 to 32 are attached to the opposite side (not shown).
35 are attached in the relationship shown in FIG. 29
b is a fixed drum which has a guide 29c that guides the magnetic tape 4 in a helical manner and regulates its position to the running height. When recording a video signal on a magnetic j-b, the recorded video signal is placed between the first and second video heads 30-32° 33-3
5 at the same time, the rotating drum 29a is rotated in the direction of the arrow 22, and the magnetic hoop 4 is attached to the lead portion 2 of the fixed drum 29b.
When the magnetic tape 4 is guided to the magnetic tape 9c and run, magnetized tracks are sequentially formed on the magnetic tape 4 by scanning by the first and second video heads 30-32, 33-35. With this configuration, when recording video signals of the same image such as a color par pattern for color signal testing and a monoscope pattern for horizontal resolution testing, for example, the Japan-US standard television signal (NTSC system) can be used as the video signal to be recorded. In this case, the vertical synchronization signal frequency of the video signal is approximately 6
At 0Hz, the horizontal frequency is 15.75 KH
It has been decided to be 7. Therefore, in the case of this embodiment, the rotary drum 29a is rotated at a constant speed 301-12 in the direction of the arrow 22, the feeding speed of the magnetic tape 4 is set three times that of the conventional example, and the image shown in FIG. When the same image signal such as a color par pattern for NTSC color signal test and a monoscope pattern for horizontal resolution test is applied to the signal input terminal, the video signal is FM modulated in the video signal recording amplification circuit 24 and the first and second It is added to the video heads 30-32°33-35, and the sixth
Magnetization shown] - racks are formed one after another. That is, the magnetization track Δ1 in FIG. A2. In A3, the first video heads 30 to 32 scan the magnetic tape surface in the direction of arrow 22, and scan the magnetic tape surface in the direction of arrow 2513.
4 are moved and formed simultaneously. In this case, recording of the video signal on the magnetized track is possible even without the horizontal synchronization signal as shown in the figure. 1 is performed, and then the second video head 33 to 35 scans the magnetized track B.
1, B2, and B3 are formed simultaneously, and the remaining horizontal synchronizing signals of 262.5·-52; are recorded. again,
Magnetization tracks Δ4, A5, and Ae are simultaneously formed by scanning of the first video heads 30 to 32. After all, according to the embodiment of the present invention, the first video heads 30 to 32 transmit the horizontal synchronization signal of the video signal to Ol-1-2.
62, 51-1 recording, second video head 33-35
The remaining horizontal synchronization signals can be recorded in 262.51-1 to 525H, and the remaining horizontal synchronization signals can be recorded in 262.51-1 to 525H.
It is possible to form magnetized tracks of books. In the above embodiment, the case where three each of the first and second video heads are used was explained as an example, but the present invention allows the number of first and second video heads to be set to an odd number other than one. It is. For example, when five first and second video heads are provided, if they are installed at predetermined intervals using the configuration described in the above embodiment, video signals of the same image can be recorded in the conventional (115) time. It is. Further, as a further embodiment of the present invention, as shown in FIG. 7, the transfer time can be shortened even when a magnetic tape recorded on a helical type VTR is reproduced and transferred to a helical type VTR. There is. This will be explained in detail. In FIG. 7, reference numeral 37 denotes first and second video heads 39, .
．． 42 to 44 are turned to the right and rotated in the direction of arrow 45 to scan the magnetized track of the recorded magnetic tape 4' to obtain reproduction number 18 respectively. The respective outputs of the first and second video heads 39-41 and 42-44 are applied to video signal reproducing circuits T'-vI', subjected to predetermined signal processing, and outputted to the outside as video signals. Reference numeral 46 has the same structure as the rotating drum 38 of the helical type VTR player 37, and includes first and second video heads 47-49.
50 to 52 are helical type VTR recorders installed on a rotary drum 53 and rotated in the direction of an arrow 54, and video heads 47 to 49 and 50 to 52 are equipped with video signal recording circuits T''.
.about.Vl'' are connected to form a magnetized track on the magnetic tape 4''. The relationship in which the first and second video heads can scan the magnetic tapes 4', 4'' is the same as in the previous embodiment, and the magnetic tapes 4', 4'' must be run in the direction of the arrow at three times the normal speed. Well, t\Critical VTR playback l! 3
The video signal from 7 is transferred to a helical type V1'R recorder 4.
It is possible to transfer to 6. As described in the detailed description of the invention, the magnetic recording device of the present invention has a plurality of video heads arranged at predetermined intervals around the outer circumference of a rotating drum.
° Since the configuration is such that multiple video signals of the same image are applied to multiple video heads at the same time to form multiple helical magnetized tracks on the magnetic tape at the same time, it is possible to use a color pattern for color signal testing and a horizontal resolution test. The recording time when creating a reference tape by recording video signals of the same image, such as a monoscope pattern, can be shortened, and the efficiency of use of the reference tape creation device can be improved.

[Brief explanation of drawings]

Fig. 1 is a plan view of the main part of a urical VTR, Fig. 2 is a diagram of recording magnetization tracks by the device shown in Fig. 1, and Fig. 3 is a plan view of the main part of a helical VTR according to an embodiment of the present invention. Figure, 4th
The figure is a positional relationship diagram of the first and second video heads in FIG. 3, FIG. 5 is a perspective view of the rotary head device included in FIG. 3, and FIG. 6 is a recording magnetized track by the device of the present invention. figure,
FIG. 7 is an explanatory diagram of another embodiment of the present invention. 1...Cassette 1-case, 4...Magnetic tape, 17
... Ki 1! Bustan, 18...Pinch roller, 24
...Video signal recording amplification circuit, 29a...Rotating drum, 30.31.32...First video head, 33.
34.35...Second video head agent Yoshihiro MorimotoFigure fFigure 2Figure 3Figure 4

Claims (1)

[Claims] 1. A rotary head device in which a plurality of video heads having predetermined intervals are provided on the outer periphery of a rotating drum at 180° intervals, and a magnetic tape in which the magnetic tape is guided in a helical shape on the outer periphery of the rotary head device and runs. A traveling means and a video signal amplification circuit for applying a video signal to the plurality of video heads are provided, and the video signal is simultaneously applied to the plurality of video heads to simultaneously form a plurality of helical magnetized tracks on the magnetic tape. Magnetic recording device.