JPS60109012A - Magnetic recording and/or reproducing device - Google Patents

Abstract

PURPOSE:To decrease the number of magnetic heads and to reduce the size of a drum by providing a supporting member extending between a couple of piezoelectric elements arranged successively to a rotary drum, fitting a magnetic head to its center, and displacing the couple of piezoelectric elements in the opposite directions to an azimuth angle. CONSTITUTION:A holding member 21 is fixed so that the rotating shaft of the rotary drum run through the hole 22 of the member 21, and the piezoelectric elements 24a and 24b are fitted atop of a substrate 23 fixed to the holding member 1 in parallel at an interval. Adhering members 25a and 25b as lever fulcrum are provided on the piezoelectric elements 24a and 24b, the supporting member 26 is provided thereupon extending to between them, and the magnetic head 27 is fitted to the center. The piezoelectric element 24a is contracted and the other piezoelectric element 24b is extended to set the magnetic head 27 at the azimuth angle. Consequently, the number of magnetic heads is decreased and the rotary head is reduced in size.

Description

DETAILED DESCRIPTION OF THE INVENTION The technical field of the invention relates to magnetic recording and/or reproducing devices such as rotary scanning VTRs.

BACKGROUND OF THE INVENTION Various types of rotary scanning VTRs have been proposed in the past, including those using a drum as shown in FIGS. 1A and 1B. This drum 1 is used in a two-head azimuth helical scan type VTR, and has a rotating drum 2 and a fixed drum 3 arranged coaxially.
Two magnetic heads 4 and 5 are provided at symmetrical positions spaced apart by a predetermined azimuth angle to prevent crosstalk from adjacent tracks.

In a VTR using such a drum 1, as shown in FIG.
, drum 1, post 9 and capstan roller ]0
The magnetic head Φ is conveyed in the direction of the arrow through the magnetic head 1 and the rotary drum 2 of the drum 1 is rotated in the direction shown by the arrow.

5, the magnetic tape 6 is helically scanned to record and reproduce information.

In addition, as Ike's rotary scanning VTR, as shown in FIG.
~ ] 4 are provided, and two of these four magnetic heads facing each other are set at different azimuth angles as a pair, and in the standard mode, for example, magnetic heads 11 + 13 are used,
In the triple mode, there is also a Φ head azimuth helical scan type in which recording and reproduction are performed using magnetic heads 12+14.

In this way, in conventional magnetic recording and reproducing devices that employ the azimuth recording method, there is no illusion. i: Since it is necessary to fix one or two sets of magnetic heads at predetermined azimuth angles, it is troublesome to install them, and the rotating drum becomes large.

OBJECTS OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a magnetic recording and/or number reproducing device suitably configured so that the number of magnetic heads can be reduced and the rotating drum can also be made smaller. It is something.

Summary of the invention The invention is a magnetic recording and/or reproducing method in which information is recorded and/or reproduced by helically scanning a magnetic tape that is fed at a predetermined angle in the outer circumferential direction of a rotating drum using a magnetic head provided on the rotating drum. In the apparatus, a pair of piezoelectric elements are arranged side by side on the rotating drum, a support member is provided across the pair of piezoelectric elements, and the magnetic head is attached to the support member approximately in the center between the pair of piezoelectric elements, By displacing the pair of piezoelectric elements in opposite directions, the magnetic head is laterally struck to selectively set different azimuth angles.

Example FIGS. 4A to 4D are diagrams showing essential parts of an embodiment of the present invention.

In this example, a hole 22 is formed in the holding member 21, and this hole z2
By passing the holding member 2 through the rotating shaft of the rotating drum and fixing it, the holding member 2 is rotated together with the rotating drum. A substrate 23 is fixed to the holding member 21 extending in the radial direction of the rotating drum, and a pair of piezoelectric elements '24 a are attached to the tip of the substrate 23 .

24k) are installed in parallel and spaced apart. Piezoelectric element 24a.

On 24b is an adhesive member 25a which also serves as a lever fulcrum.

A support member 26 is provided between the piezoelectric elements 24a and 24b via adhesive members 25a and 25bE, and a magnetic head 27 is attached to the support member 26 approximately at the center between the piezoelectric elements 241 and 24b.

In this embodiment, a pair of piezoelectric elements 24a and 24b are made of the same material and configured with the same electrode direction, and vehicle pressures of different polarities are applied alternately to each other, so that as shown in FIG. 5A, At the same time as one piezoelectric element 24a is expanded, the other piezoelectric element 24b is contracted, and the magnetic head 27i96
As shown in the figure, one predetermined azimuth angle having an angle θ with respect to the track 29 of the magnetic tape 2B is set, and then, as shown in FIG. By extending the local piezoelectric element 24b,
The magnetic head 27 is attached to the magnetic tape 2B as shown in FIG.
The operation of setting a predetermined azimuth angle having an angle θ2 with respect to the truck 29 and the adjacent trunk 30 is performed alternately. Note that the polarity of the voltage applied to the piezoelectric elements s4a and 24b is changed, that is, the azimuth angle is changed while the magnetic head 27 is away from the magnetic tape.

Here, the difference between the angles θ1 and θ2 of the magnetic head 27 with respect to the tracks 29 and 30 shown in FIG. 6 is 4° to 7°.
To some extent, crosstalk caused by the adjacent trunks 29, 30 is sufficiently attenuated by azimuth loss, and such an angular difference can be easily obtained by displacing the pair of piezoelectric elements 24a, 24b in opposite directions. can.

Note that the invention can be effectively applied not only to VTRs but also to other magnetic recording and reproducing devices.

Further, since the displacement amount of the piezoelectric elements 24a and 2Φb can be controlled by the applied voltage, it is possible to set not only the two different azimuth angles as described above but also many different azimuth angles.

Effects of the Invention As described above, according to the invention, one magnetic head can be set at different azimuth angles, so the conventional two heads can be changed to one head, and the scratch head can be changed to two heads or one head and its individual heads. It is possible to reduce the number of parts, make it easy to install, and also make the rotating drum smaller.

[Brief explanation of the drawing]

Figures 1A, B, 2 and 3 are views showing the conventional example; Figures 4A-D are views showing the fastening portion of the non-inventive embodiment; Figures 5A, B and 6; is a diagram showing the operation. 21... Holding member 22... Hole 23... Substrate 24a, 24b... Piezoelectric element 2
5a, 25b...adhesive part side 26...support member 27...magnetic head 28...magnetic tape 29,
30...Truck. Patent Applicant Olympus Optical Industry Co., Ltd. Representative Patent Attorney Hidetoshi Sugimura Patent Attorney Oki Sugimura Figure 1 Figure 2 Figure 3 Figure 4 Figure 2f Figure 5 Figure 61-1

Claims (1)

[Scope of Claims] 1. Magnetic recording and reproduction in which information is recorded and/or reproduced by helically scanning a magnetic tape that is fed over a predetermined angle on the outer peripheral surface of a rotating drum using a magnetic head provided on the rotating drum. /Or in the reproducing device i'2, a pair of piezoelectric elements are provided side by side on the rotating drum, and a support member is provided to pass between the pair of piezoelectric ligatures, and the support member is provided approximately at the center between the pair of piezoelectric elements. The magnetic recording and/or device is characterized in that the magnetic head is selectively set at different azimuth angles by displacing the pair of piezoelectric elements in opposite directions when the magnetic head is set. Or playback equipment.