JPS62124621A - Recording or reproducing device - Google Patents

Abstract

PURPOSE:To previously prevent the useless wear of a rotating head and damages of recording media by interlocking a means changing the projection quantity of the rotating head from a rotating cylinder with a means ordering the rotating head to record or reproduce. CONSTITUTION:The titled device has such a constitution that the means changing the projection quantities of the rotating heads HA and HB from the rotating cylinder 4 is interlocked with the means ordering the rotating heads HA and HB to record or reproduce. In order to change the projection quantities of the rotating heads HA and HB, a piezoelectric element 5 is used as a material body varying its shape. By applying the prescribed voltage or current to the piezoelectric element 5 it is expanded, and the rotating heads HA and HB are caused to project by several 10mum from the rotating cylinder 4 and brought into contact with a magnetic tape 1. By changing a voltage or current impressed on the piezoelectric element 5, it is contracted to eliminate the contact with the magnetic tape 1. Thus the wear of the rotating head and the damage at a trace position on the magnetic tape are minimized.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a device for recording, recording, or reproducing signals on the medium by wrapping a recording medium around the outer peripheral surface of a rotating cylinder equipped with a rotating head. It is.

[Conventional technology]

FIG. 6 is a diagram showing an example of the main part configuration of a rotary head assembly of a conventional magnetic recording/reproducing device of this type, in which 1 indicates a magnetic tape;
2 is a rotating head, 3 is a fixed cylinder, and 4 is a rotating cylinder.

In FIG. 6, a tape guide groove is formed in the fixed cylinder 3. By fixing the amount by which the rotary head 2 protrudes from the rotary cylinder 4 and the fixed cylinder 3 to several tens of μm, the magnetic tape 1 wound around the rotary head assembly at a predetermined angle is brought into contact with the rotary head 2. is always maintained.

[Problem that the invention seeks to solve]

When the running of the magnetic tape is stopped in a device using a rotating head assembly such as the one described above, the rotating head repeatedly traces the same location on the magnetic tape, resulting in wear of the rotating head and damage to the magnetic tape 1. The disadvantage was that the trace area was severely damaged. Due to this drawback, current VTRs (video tape recorders) have a risk of damaging the magnetic tape in a recording standby state (hereinafter referred to as a pause state). For this reason, it is common to have a safety device that automatically releases the pause state after about 5 minutes, for example. However, in the case of , it is impossible to maintain a pause state for a long time of 7 minutes or more with a single operation, and even in 5 minutes, the head traces the tape 18,000 times (60 x 60 x 5 =). remains the same,
No fundamental solution has been reached.

This invention was made in order to solve the above-mentioned conventional problems, and its purpose is to provide a recording or reproducing device that can prevent unnecessary wear of the rotating head and damage to the recording medium. shall be.

[Failure to solve the problem]

For this purpose, the recording or reproducing device according to the present invention is such that a means for changing the amount of protrusion of the rotary head from the rotary cylinder is linked to a means for instructing the rotary head to perform recording or reproducing. be.

[Effect]

In the configuration as described above, in a recording standby state in which the rotary cylinder around which the recording medium is wound is rotating, the rotary head is prohibited from protruding from the rotary cylinder, and the recording medium and the rotary head are not allowed to come into contact with each other. That's what I do.

〔Example〕

FIGS. 1(a) and 1(b) are diagrams showing the structure of a rotary head assembly in a recording/reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a schematic configuration of the entire apparatus according to this embodiment. It is.

In FIGS. 1 and 2, 1 is a magnetic tape, 2 a,
2b, 2a', 2b' are head substrates each having a one-piece structure with piezo elements 5, 5' used as objects whose shape can be changed; 3 is a head board having a magnetic tape guide groove for guiding the magnetic tape 1; A fixed cylinder 4 is used to wrap the head at a predetermined angle, and 4 is a rotary cylinder to which a pair of head substrates each containing piezo elements 5 and 5' are fixed.

FIGS. 3(a) and 3(b) are diagrams showing the head substrate section in FIG. 1 in detail. A lead wire 6 is connected to the piezo element 5.
a, 6b, and this lead wire 5a.

By applying a predetermined voltage or current to 6b by a piezo drive circuit 13, which will be described later, it becomes possible to expand and contract in the direction of the arrow in FIG. 3(a). This piezo element 5 is connected to the head substrate 2.
Fig. 3(b) shows an integrated structure made by sandwiching between a and 2b, adhering, welding, etc.

In the recording and reproducing device configured as described above, recording,
Magnetic tape 1 and rotating head) IA, as in the state of playback
If the HB must be in contact, the operating section 15
The capstan drive circuit 14 rotates the capstan 16 as appropriate based on data D corresponding to the manual operation of
0 to perform the desired signal processing, and at the same time, the piezo drive circuit 13 extends the piezo element 5 by applying a predetermined voltage or current to the piezo element 5, as shown in FIG. 1(a). , the rotary heads HA and HB are made to protrude from the rotary cylinder 4 by several tens of micrometers and brought into contact with the magnetic tape 1.

In addition, when the magnetic tape 1 and the rotary head 2a do not need to contact each other as in the above-mentioned pause state, the data D causes the capstan drive circuit 14 and the recording/reproducing signal processing circuit 1 to
0 as appropriate and also controls the piezo drive circuit 13 to change the voltage or current applied to the piezo element 5 to contract the -bizo element 5 and eliminate contact with the magnetic tape 1. Note that 11 is an input terminal for a signal to be recorded, 12 is an output terminal for a reproduced signal, and 17 is a pinch roller.

In the embodiment of FIG. 3, the rotary head HA.

In order to change the amount of protrusion of the HB, a piezo element 5 is used as an example of an object whose shape can be changed, while an example in which a shape memory alloy is used as an object whose shape can be changed is shown in Fig. 4. . The shape memory alloy 7 shown in FIG. 4 is shown in FIG.
Although it is a flat plate as shown in FIG. 4, when a constant current is passed through the lead wires 8a and 8b, heat is generated due to the electrical resistance effect of the shape memory alloy 7 itself, and the shape memory alloy 7 changes as shown in FIG. FIG. 5 shows the shape memory alloy 7 on the head substrates 2a and 2b.
This shows an integrated structure that has been inserted between the two.

In FIG. 5, one head substrate 2a has two holes 2.
1 a e 2 l b are provided, and this hole 21a.

21b, two rods 20a and 20b fixed to the other head substrate 2b are inserted, a shape memory alloy 7 is placed between both head substrates 2a and 2b, and a spring provided on both hend substrates 2a and 2b, respectively. Mounting rods 22a, 22b and 2
3a and 23b have springs 29a.

By attaching 29b, both head boards 2a.

2b is combined.

In the above structure, by fixing the head substrate 2b to the rotating cylinder 4, the head substrate 2a can move in the direction indicated by the arrow in FIG. 5 with respect to the rotating cylinder 4 due to changes in the shape memory alloy 7. As long as the shape memory alloy 7 does not change, the rotating head 2a remains at a constant position.

By using the above structure, the shape memory alloy 7 is not energized during recording, reproduction, etc., so that the head HA protrudes from the outer periphery of the rotary cylinder 4 and the magnetic tape 1 is
and the rotating head HA are brought into contact with each other. In addition, in the standby state and pause state, the shape memory alloy 7 is energized and the rotating head H
A is pulled in from the rotating cylinder 4 so that it does not come into contact with the magnetic tape 1.

〔Effect of the invention〕

As explained above, this invention has a structure in which the means for changing the amount of protrusion of the rotary head from the rotary cylinder is linked to the means for issuing commands for recording or reproduction by the rotary head, thereby eliminating the need for unnecessary rotary heads and magnetism. This has the effect of preventing tape contact and minimizing damage to the recording medium and wear of the rotating head.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the structure of a rotary head assembly in a recording or reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram showing a schematic configuration of the entire apparatus in FIG. 1, and FIG. a) # (b) is a detailed view of the rotary head substrate part in FIG. 1, FIG. 4 is an explanatory diagram of the shape memory alloy, FIG. 5 is the shape recording tape of FIG. 4, and 2a and 2b are the A rotating head substrate, 3 a fixed cylinder, 4 a rotating cylinder, 5 a piezo element, 10 a recording/reproducing signal processing circuit, 13 a piezo drive circuit, 14 a capsun drive circuit, and 15 an operating section. Agent Patent Attorney 1) Haru Kitatake Figure 1

Claims (1)

[Claims] In an apparatus for recording or reproducing signals on the medium by winding a recording medium around the outer peripheral surface of a rotating cylinder provided with a rotating head, the rotating head may be used as a means for changing the amount of protrusion of the rotating head from the rotating cylinder. A recording or reproducing device characterized in that it is linked to means for issuing a recording or reproducing command.