JPH01256015A - Recording and reproducing cylinder - Google Patents

Abstract

PURPOSE:To attain small size and log service life by providing a displacement adjustment means controlling the displacement of a head to a stator section in noncontact state with the rotor section. CONSTITUTION:A displacement adjustment means controlling the displacement to the head 11 provided on the rotor 1 is provided on the stator 2 in noncontact state with the rotor 1. That is, the rotary head 11 is fitted to ahead mount plate 12, which is made of a plate easily deformed and a drive plate 13 using a magnetic material is mounted thereto. An electromagnetic force is generated by giving a current to an electromagnetic force generating element 21 to attract the drive plate 13 thereby displacing the rotary head 11. Thus, the rotary head 11 is controlled from the stator 2 in the noncontact state with the rotor 1. Thus, no slide part is required, small size and long service life are attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording/reproducing cylinder, and more particularly to a recording/reproducing cylinder having a movable head drive mechanism suitable for track tracing.

[Conventional technology]

The conventional device, as described in Japanese Patent Application Laid-Open No. 56-61028, attaches a rotary head to an electro-mechanical transducer, moves the head by shifting the electro-mechanical transducer, and tracks a predetermined track. was going on. However, since the head and the conversion element rotate together, a slip ring is generally provided to supply power to the element.

[Problem to be solved by the invention]

However, in the above-mentioned conventional technology, since the electro-mechanical conversion element is rotated and used, a slip ring is used to supply power to the element, so the device becomes large and
The structure became complicated.

Further, since the cylinder has a sliding part, there is a problem that the sliding part is worn out and the life of the cylinder is shortened. Further, there is a problem in that sliding noise is likely to occur and may cause deterioration of one image.

SUMMARY OF THE INVENTION An object of the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a high-precision recording/reproducing cylinder that is compact, has a simple structure, and has a long life.

[Means to solve the problem]

In order to achieve the above object, the recording and reproducing cylinder of the present invention has a rotating part and a fixed part, and the recording and reproducing cylinder records and reproduces information on a tape using a head provided on the rotating part. The present invention is characterized in that a displacement adjusting means for controlling the rotation is provided in the fixed part in a non-contact state with the rotating part (claim 1).

In addition, this head is attached to the rotating part via a movable member,
A displacement force generating element such as an electromagnetic force can be used as the displacement adjustment means, or a permanent magnet can be used as the movable member (
Claim 2 or 3).

Furthermore, the displacement force generating element is divided and disposed on the fixed part side for the plurality of heads (claim 4 or 5).

Further, in a recording/reproducing cylinder that performs recording/reproduction on a tape by a rotating head, a displacement adjusting means for controlling the displacement of the head is provided before or in a predetermined section of the recording/reproducing section by the head, and furthermore, the displacement adjusting means is provided in a non-contact manner with the rotating part. It can be fixed in a state (claim 6.7).

[Effect]

According to the above configuration, even when the head rotates, the means for controlling the displacement of the head is in a non-contact state with the one-rotation portion, so that no sliding noise is generated (claim 1).

Then, by attaching the head to the rotating part via a movable member and displacing it using electromagnetic force or the like, or by using a permanent magnet for the movable member, the structure can be made simple (Claim 2). ,3).

Furthermore, by dividing the displacement force generating element, it is possible to simultaneously control a plurality of rotary heads, and by wrapping the elements of the divided part, it is possible to smoothly switch control (claims 4 and 5). ).

Since the displacement of the head can be controlled before and after the recording or reproducing section, accurate tracking can be performed from the beginning to the end of recording or reproducing, and by controlling without contacting the rotating part, It can be made into a high-precision cylinder with a small and simple structure (Claim 6.7).

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention, in which 1 is a rotating cylinder and 2 is a fixed cylinder. 2 is a plan view of the fixed cylinder 2, and FIG. 3 is a plan view of the rotating cylinder 1. The six-rotation cylinder 1 is fixed to a shaft 3 and rotated by drive motors 4a and 4b.

The rotary spatula 11 is attached to a head mounting plate 12, and the head mounting plate 12 is made of a plate material that is easily deformed. Further, for head mounting, a drive plate 13 is attached to the plate 12 using a magnetic material.

An electromagnetic force generating element 21 for driving the rotating magnetic head 11 is disposed facing the drive plate 13 and is also disposed close to it, and the electromagnetic force generating element 21 is disposed around the rotating shaft 3. There is.

Non-contact signal transmitting means 22a, 22b are provided inside the electromagnetic force generating element 21 to transmit electrical signals from the rotating head 11 to the fixed side.

As shown in FIG. 2, the electromagnetic force generating element 21 is divided into two parts 21a and 21b in the example of the present invention, each of which can generate a driving force independently. In addition, in this embodiment, the rotary head is also used as shown in Fig. 3 for explaining the principle.
They are installed as two pieces, la and llb.

When there are two or more rotating heads 11 to be driven, the number of electromagnetic force generating elements 21 may be increased in accordance with the number of heads.

In addition, a shield member (not shown) protects the rotary head 1 from
The influence of the magnetic field of the electromagnetic force generating element 21 on the electromagnetic force generating element 21 is reduced. In the figure, 23 is a tape, 24 is a roller, and 25 is a mounting screw.

Next, the operation of this embodiment will be explained. FIG. 4 is an enlarged view of the rotating head 11 section. The electromagnetic force generating element 21 includes:
A coil 26 is wound around it, and by passing a current through it, an electromagnetic force is generated, which attracts the drive plate 13 and rotates the rotating head 1.
1 is displaced by δ.

The amount of displacement δ can be arbitrarily set by controlling the current applied to the coil 26.

Various structures of the electromagnetic force generating element 21 are considered, such as the structure shown in FIG. 5 in addition to the structure shown in FIG.

, FIG. 6 shows the range in which the amount of displacement of the rotary head 11 is controlled. In order to reproduce the image, the image signal must be approximately 190
It is sufficient to read the data in the interval A+B of the degree, but in order to mechanically displace the head 11.

It is necessary to provide a preliminary section C and a settling section to allow the head 11 to move smoothly.

In section C, the position is displaced to a predetermined position, and S.

The head 11 is immediately positioned on a predetermined track from this point. Also, when there is a large displacement in a section, the displacement is smoothly decreased so that the displacement becomes small when reaching one point S2.

Furthermore, controlling the displacement of the head by providing this preliminary section and settling section can also be applied to a recording/reproducing cylinder using a conventional slip ring, which can greatly improve tracking accuracy. be.

The section for controlling the head 11a (or 11b) is E.
become that way. In this way, when the control section E is larger than 180 degrees, if the head is driven in this section by a single electromagnetic force generating element 21, the heads lla and llb will be driven simultaneously. Since predetermined tracking is impossible unless heads lla and llb are each driven independently, in this embodiment, the electromagnetic force generating element 21 is separated into 21a and 21b, as shown in FIG.

Then, sections C and A are driven by 21a, and sections B and D are driven by 21a.
Drive with 1b. When the rotating head 11 moves to section B, current is passed through each coil 26 so that the electromagnetic forces generated by the electromagnetic force generating elements 21a and 21b are the same, so that the rotating head 11 smoothly moves from section A to section B. It is possible to move to B.

The connecting portion between the electromagnetic force generating elements 21a and 21b may be made by gradually changing the width as shown in FIG. 9(a), or by aligning them as shown in FIG. 2, or by changing the width gradually as shown in FIG. 21a and 21
b may be overlapped, or the third element 21 as shown in (c)
c may be added.

The operation of displacing the rotary head 11 and performing tracking will be described with reference to FIG. When the tape speed V' during playback differs from the tape speed V during recording with respect to the track 27 recorded on the tape 23, for example, the rotary head 11 scans in the direction of arrow H in the figure. Therefore, it is necessary to displace the head 11 according to the rotational position of the rotary head 11. 61 at the two points in Figure 6. FIG. 8 shows an example of how to apply voltage to the electromagnetic force generating elements 21a and 21b to cause a displacement of 62 at point S1. The waveform in the figure is the voltage waveform applied to the electromagnetic force generating element 21a, and the waveform 21B is the same?
! ! This is a voltage waveform applied to the magnetic force generating element 21b. This is a switching signal for the SW multiplied image signal in the lower row, and for example, the period from time t1 to 20 is a period in which an image is reproduced by the rotary head lla.

Between time t and t5, the head llb reproduces the data. During the two-hour period t5 to t7, the head llb reproduces the data again.
The section a is being played back.

The voltage application method will be explained in section t and mustard 3. head l
In order to displace la by δ1 at time t2, the electromagnetic force generating element 21 a d Vat time t, V at time t1.

A voltage waveform 21A is given that has a voltage of . here,
Considering the control during section C, from tl-Δt. −ΔV
, so as to give a voltage of . Also, after t2, t, +
A voltage of v1+Δv2 is applied up to Δt'.

Then, V is applied again to drive the rotary head llb at t3-Δt. -Δv1 voltage.

On the other hand, the same voltage V□ as that of the element 21a is applied to the electromagnetic force generating element 21b in accordance with the time t2 when the head 11a passes the switching point P.

Then, in order to smooth the movement of the head lla for one revolution, a voltage of V knee .DELTA.V is applied at t2-.DELTA.t' as an overlap section.

At time t, a voltage of v2 is applied so that the rotary head lla is displaced by δ2, and a voltage is applied continuously until t, +Δt' for control during the interval. After that,
Similarly to 21a, the voltage v is applied again to drive the head llb.
1-Δv1 and waits.

As described above, the applied voltage for driving is changed according to the rotational position of the rotary head 11, and the switching part P of the electromagnetic force generating element 21 is set so that the head passes smoothly through the switching part P of the electromagnetic force generating element 21.
By applying a voltage to 1b, the rotating head 1
1 can be smoothly displaced by a predetermined amount.

At this time, since the electromagnetic force generating elements 21a and 21b are on the fixed side, power can be easily supplied, and since there is no need to provide a slip ring, the structure can be made smaller, and the absence of sliding parts allows for a long life. It is also possible to achieve Moreover, no sliding noise occurs, and a good image signal can be obtained.

Although this embodiment has been described using an example in which the forces required to drive the heads 11a and 11b are approximately equal, it goes without saying that they do not necessarily have to be equal. In this case, a predetermined driving force may be applied to each head to generate the required displacement amount. That is, in this embodiment, in FIG. 8, the set voltage is set to V at tl and t3. Although the explanation was given by setting t, V is given by t. and t3
V given by. may be different.

Furthermore, if the heads to be controlled are installed at four locations on the rotating cylinder, as shown in FIG. 10, for example, four electromagnetic force generating elements may be provided.

Further, in this embodiment, the head is driven using electromagnetic force, but a permanent magnet may be used for the mounting plate 12 or the driving plate 13 so that both attractive force and repulsive force can be obtained. It goes without saying that the force for driving the head may be obtained by air pressure or the like.

〔Effect of the invention〕

As described above, according to the present invention, since the rotary head can be controlled from the fixed part side without contacting the rotating part, a recording/reproducing cylinder that is compact and has a long life can be obtained because no sliding part is required. Furthermore, since no sliding noise occurs, a good image signal can be obtained.

Further, since the movable member can be displaced by electromagnetic force or the like or a permanent magnet can be used for the movable member, a recording/reproducing cylinder with a simple structure can be obtained.

Furthermore, by dividing the electromagnetic force generating elements, it is possible to control a plurality of rotary heads at the same time.

Since the heads before and after the recording/reproducing section can be controlled, accurate tracking can be performed from the beginning to the end of the recording/reproducing section, and an extremely accurate recording/reproducing cylinder can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a plan view of a fixed cylinder, and FIG. 3 is a plan view of a rotating cylinder.
Fig. 4 is an enlarged view of the head drive unit, Fig. 5 is an enlarged view showing a modification of the head drive element, Fig. 6 is a head drive section diagram, Fig. 7 is an explanatory diagram of track tracing, and Fig. 8 is an applied voltage. Waveform graphs, FIGS. 9(a), (b), and (c) are explanatory diagrams showing another example of the connection part of the head driving element, and FIG. 10 is an explanatory diagram showing another example of the arrangement of the head driving element. FIG. 1... Rotating cylinder, 2... Fixed cylinder, 11.
... Rotating head, 12... Head mounting plate, 13...
Head drive plate, 21... Electromagnetic force generating element, 23...
Tape agent Patent attorney Tatsu Unuma 2 Figure 1 1: [EIIE'zResoda 13
, 13a, 13b: Head Keg ft) K12
．． 12a, 12b: Hayashi γ-do JXf'
26; Coil Fig. 2 240-ra Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 (b) (C) Fig. 10

Claims (1)

[Scope of Claims] 1. A recording and reproducing cylinder that has a rotating part and a fixed part and performs recording and reproducing on a tape by a head provided on the rotating part, wherein a displacement adjusting means for controlling displacement of the head, A recording/reproducing cylinder, characterized in that the recording/reproducing cylinder is provided in the fixed part in a non-contact state with the rotating part. 2. The cylinder according to claim 1, wherein the head is attached to the rotating part via a movable member that is movable in a direction substantially perpendicular to the rotating surface of the rotating part, and the displacement of the movable member is controlled by electromagnetic force or the like. A recording/reproducing cylinder characterized in that a displacement force generating element controlled by the fixed part is provided on the fixed part. 3. The recording/reproducing cylinder according to claim 2, wherein a permanent magnet is used as the movable member. 4. The cylinder according to claim 1, 2 or 3, wherein a plurality of the heads are provided, and a displacement force generating element is separately arranged in the fixed portion around the rotation center of the head. A recording and reproducing cylinder. 5. The recording/reproducing cylinder according to claim 4, wherein the divided portion of the displacement force generating element is configured such that the elements overlap each other. 6. In a recording and reproducing cylinder that has a rotating part and a fixed part and records and reproduces information on a tape using a head provided on the rotating part, a recording and reproducing cylinder of the head is provided in a predetermined section before or after a recording and reproducing section by the head. A recording/reproducing cylinder characterized by being provided with a displacement adjusting means for controlling displacement. 7. The recording/reproducing cylinder according to claim 6, wherein the displacement adjusting means is provided on the fixed part in a non-contact state with the rotating part.