KR0154677B1 - Headdrum of magnetic recording and reproducing apparatus - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head drum of a magnetic recording and reproducing apparatus, and more particularly, a head drum capable of reading a signal from two signal tracks having different input values using only one head on the head drum. The present invention relates to a head for scanning signals of magnetic tapes formed by alternating an R track having an input value of + θ ° and an L track having an input value of −θ °, respectively, on the left and right sides with respect to the center line S, respectively. First to fourth core members C1, C2, and C3, which are divided by a pair of gaps 12 and 14 that are inclined by θ ° and cross each other in an X-shape and the X-shaped gaps 12 and 14; C4) and a head 10 consisting of first to fourth coils simultaneously winding two core members on both sides with respect to the gap 12 of + θ ° and the −θ ° gap 14, respectively. Installed at one side of (5), the head 10 in the position having a distance of 180 ° with the head 10 By installing the balancer (11) having the same weight as the one and characterized in that the scan to combine the R track and L track with one head.

Description

Head drum of magnetic recording and reproducing apparatus

1 is a view showing an installation configuration of a conventional head.

2 is a view showing the installation configuration of the head according to the present invention.

3 is a perspective view showing the configuration of the head of the present invention.

* Explanation of symbols for main parts of the drawings

10: Head 11: Balancer

12,14: gap 21: first coil

22: second coil 23: third coil

24: fourth coil C1: first core member

C2: second core member C3: third core member

C4: fourth core member

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head drum of a magnetic recording and reproducing apparatus. In particular, only one head is installed on the head drum, and a head capable of reading signals from two signal tracks having different input values using the single head is used. It is about a drum.

In general, VRL is a device for recording or reproducing video and audio signals on a magnetic tape, as is well known, and such a device is generally used in a head integrally formed with the head drum by contact transfer of magnetic tape on a rotating head drum. Video signals are recorded or reproduced.

The heads are each provided with a pair of heads at intervals of 180 ° on the head drum. In addition, an R track and an L track are alternately input to the magnetic tape, and one of the heads repeatedly scans the R track on the magnetic tape and the other scans the L track.

On the other hand, the image signal recorded on the magnetic tape is inclined to form a signal track in order to increase the signal receiving capacity, wherein the head drum is installed to have a predetermined inclination angle based on the vertical axis, the magnetic tape on the head drum It is transported horizontally in contact with about 180 °. In addition, the rotational speed of the head drum is rotated much faster than the feeding speed of the magnetic tape, and the head is configured to helical scan by contacting an image signal track formed in an inclined state on the magnetic tape. In addition, the magnetic tape forms a guard band between each video signal track and adjacent signal tracks to separate adjacent signal tracks, so that a cross talk, that is, a head with two signal tracks is provided. By simultaneously contacting the two signals are picked up at the same time to prevent the occurrence of damage to the image quality.

On the other hand, recently, in order to increase the recording density of image data per unit length in the magnetic tape, the guard band is eliminated and the signal tracks are continuously formed, but the signal recording angles inputted to the adjacent signal tracks, i. A different configuration has been developed in which a tilt angle corresponding to a recording angle of the corresponding signal track (commonly referred to as an azimuth angle, having a range of 6 ° to 30 °) on the head is developed. Thus, the head reads the signal only from the corresponding track, preventing crosstalk. Therefore, in order to increase the recording density and prevent crosstalk as described above, the head needs to give the inclination angle corresponding to the azimuth angle, and the inclination angle requires a high degree.

Looking at the configuration of the conventional head drum in detail as shown in Figures 1 and 2, the lower drum (3) is supported on the bracket fixed on the base, and the shaft is assembled through the lower drum (3) (4) and the upper drum (5) fixed to the upper end of the shaft (4) and rotating with respect to the lower drum (3) together with the shaft (4), and on the shaft (4) and the upper drum (5). It consists of a motor 6 which provides rotational force. Then, on the bottom of the upper drum 5, for example, two head bases 7 are attached so as to be height-adjustable at intervals of 180 [deg.] By a screw or the like, each head base 7 having its radial direction. The outer end is provided with a head 8 for magnetically recording or reproducing a video signal. In addition, since the rotary transformer 9 is installed between the upper drum 5 and the lower drum 3 so as to transmit a signal in a non-contact manner, the image signal supplied to or output from the head is generated without generating noise. I can receive it. On the other hand, the motor 6 is composed of a stator 6a attached to the lower drum 3 and a rotor 6b fixed to the shaft 4 to rotate with respect to the stator 6a. 6b) is configured to scan the video signal track of the tape in turn by rotating at high speed with the shaft 4 and the upper drum 5 as the current is supplied to the stator 6a.

However, such a conventional head drum should have two kinds of heads having different inclination angles according to the corresponding signal tracks, and in particular, two heads when the pair of heads 8 are mounted on the head base 7. It required a high degree of work that had to accurately match the phase of the workmanship and had a problem of poor workability.

Accordingly, the present invention has been made in view of the above problems, and an object thereof is to provide a head drum of a magnetic recording and reproducing apparatus capable of reading R tracks and L tracks having different signal input values with one head.

An object of the present invention is to configure a head for scanning a signal of a magnetic tape formed by alternating an R track having an input value of + θ ° and an L track having an input value of -θ °, based on the center line S. Each of the first to fourth core members C1, C2, divided by a pair of gaps 12 and 14 inclined by θ ° to the left and right and intersecting in an X shape and the gaps 12 and 14 of the X shape, respectively. C3, C4, and the head consisting of the first to fourth coils for winding two core members on both sides simultaneously based on the gap 12 and + θ ° gap 14 of + θ ° one side of the upper drum It can be achieved by installing a balancer having the same weight as the head in a position having a distance of 180 ° to the head to scan the R track and L track as a single head. In other words, when winding two pairs of coils forming different inclination angles on one head, only one pair of coils having inclination angles corresponding to the corresponding tracks on the magnetic tape scans the signal.

Best Mode for Carrying Out the Invention Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings.

2 shows a structure of a head drum according to the present invention, in which a head base 7 having a head 10 fixed to one side of an upper drum 5 is installed.

A balancer 11 having a weight equal to that of the head assembly, that is, the head base and the head assembly, is provided at a position spaced 180 ° from the head 10. This balancer 11 is screwed by the bolt 11a. As shown in FIG. 3, the head 10 is referred to the center line S of the head 10 when the signal angles input to the R track and the L track of the magnetic tape are + θ ° and -θ °, respectively. And a pair of gaps 12 and 14 which are inclined by θ ° to the left and right and cross each other in an X-shape, respectively. The gaps 12 and 14 are made again by using the non-conductive adhesive to the first to fourth core members C1, C2, C3 and C4 cut in an X shape in the longitudinal direction of the head 10. It is formed by gluing. In addition, on the head 10, the first coil 21, the second core member C2, and the fourth coil 21 surrounding the first core member C1 and the third core member C3 together to form −θ °. A second coil 22 wrapping the core member C4 together is installed, and the third coil 23 and the third coil 23 wrapping the first core member C1 and the fourth core member C4 together to form + θ °. A fourth coil 24 surrounding the two core members C2 and the third core member C3 is installed.

The coils are wound at predetermined intervals from each other, and pass through at least one of the X-shaped gaps 12 and 14.

Looking at the operation of the present invention having such a configuration as follows. For convenience, the signal input angle of the R track is + θ ° and the signal input angle of the L track is -θ °. First, when the head passes through the R track with an input of + θ °, a gap of + θ ° formed by the third coil 23 and the fourth coil 24 on the head to correspond to the signal input value of the R track. 12 scans the signal. Subsequently, when the head 10 enters the next track, that is, the L track having the −θ ° input, the first coil 21 and the second coil 22 on the head correspond to the signal input value of the L track. A gap of-[theta] [deg.] Formed is to scan the signal.

The gaps of + θ ° and −θ ° are such that signals that do not coincide with the angle of formation are not scanned (also referred to as 'Azimuth loss'), so that signals can only be scanned on the corresponding track.

According to the present invention, it can be seen that one track is scanned during one rotation of the head 10. Therefore, the track of the magnetic tape should be set to a 360 ° phase angle from the start of the R track to the start of the L track. This is so far compared to the conventional method in which two head assemblies are installed at a periphery of the head drum 42 and two head assemblies are set at a phase angle of 180 ° for one track and an adjacent track. The scan will be performed with the camera wound at least 270 °. That is, conventionally, the magnetic tape is scanned by fitting about 180 ° on the head drum in order to provide a phase difference of 180 °, but the present invention increases the winding time of the magnetic tape because one track phase angle becomes 270 ° or more. Will be. This should make the inclination angle of the track of the magnetic tape larger.

As described above, in the head drum of the magnetic recording and reproducing apparatus according to the present invention, since the R track and the L track can scan signals at one head, the head drum is mounted by mounting only one head drum assembly on the head drum. The assembly can be completed to improve the assembly precision of the head, as well as to have the effect of eliminating the need to manufacture each head having two angles when manufacturing the head.

Claims (1)

In configuring a head for scanning a signal of a magnetic tape formed by alternating an R track having an input value of + θ ° and an L track having an input value of -θ °, θ ° to the left and right sides with respect to the center line S, respectively. The first to fourth core members C1, C2, C3, and C4 divided by a pair of gaps 12 and 14 which are inclined by each other and cross each other in an X-shape and the X-shaped gaps 12 and 14; The upper drum 5 includes a head 10 formed of first to fourth coils simultaneously winding two core members on both sides with respect to the gap 12 of + θ ° and the −θ ° gap 14. It is installed on one side of the head 10, the position having a distance of 180 ° and the balancer 11 having the same weight as the head 10 is installed to combine the R track and L track as one head Head drum of a magnetic recording and reproducing apparatus characterized by scanning.