JPH03219460A - Rotary head cylinder device - Google Patents

Abstract

PURPOSE:To perform recording/reproduction with high quality by comprising a lower cylinder which guides the feed of a magnetic tape in prescribed tilt angle and shape. CONSTITUTION:An upper cylinder 3 loading a magnetic head 4 directly connected via a rotary disk 2 is rotated by rotating a rotary shaft 1 with a motor 10. A tape feed guide part 13 on the outer peripheral plane of the lower cylinder 5 is provided with a prescribed angle theta, and the winding start point and the winding end point of the magnetic tape are set as the highest point, and the lowest point is set in the neighborhood of a center part while winding the magnetic tape. Furthermore, this device is comprised in such a way that a negative tilt angle in a feed direction is provided in the neighborhood of the winding start point, and a positive tilt angle is provided in the neighborhood of the winding end point. The magnetic tape 17 is started to feed at an angle rather steep more than the prescribed angle along the guide part 13 at the input side part of the device, and a force in vertical lower direction against the prescribed angle is generated. In such a way, it is possible to reduce tape comb-up phenomenon due to the rotation of the cylinder 3, and also, to prevent a recording pattern bending, and to perform the recording/reproduction with high quality.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a rotary head type magnetic recording/reproducing device.
This invention relates to a rotating head cylinder device.

[Prior Art] Conventionally, a rotary head cylinder device in a signal recording and reproducing device for recording and reproducing video, etc. is disclosed in Japanese Patent Application Laid-Open No. 63-175208.
As described in the publication, it has an upper rotating cylinder equipped with a magnetic head, and records and plays back signals by rotating the upper rotating cylinder with the magnetic tape along the tape running guide and running surface of the lower fixed cylinder. It is something to do.

In addition, as described in Japanese Patent Application Laid-open No. 58-37866, the middle cylinder equipped with a magnetic head is installed on a fixed shaft via a shaft 6-receiver, and is rotationally driven by a motor built in the lower cylinder. It is. In the above structure, the upper cylinder and the lower cylinder are fixed to the fixed shaft,
A magnetic tape runs, and signals are recorded and reproduced by the rotation of an inner cylinder.

With the above structure, the magnetic tape runs at a predetermined speed along a linear tape running guide having a predetermined inclination angle,
Since the rotation speed of the upper rotating cylinder is high, the magnetic tape and the magnetic head fixed to the upper rotating cylinder come into contact with each other at a very high relative speed.

Incidentally, the linearity of the conventional tape running guide section is about 1 to 2 .mu.mp-p due to the influence of processing technology and the like.

[Problems to be Solved by the Invention] As the above-mentioned prior art, in a rotary head cylinder device having a fixed lower cylinder and an upper cylinder equipped with a magnetic head, it is difficult to reduce the scraping force on the magnetic tape due to high-speed rotation of the upper cylinder. No consideration was given to reducing the longitudinal vibration of the running tape, tape squealing phenomenon, unstable running of the tape running system in general, and tape running guides and running surfaces in response to the tape lifting force. In order to make the tape follow the magnetic tape, problems such as head life and tape life due to increasing tape tension, as well as problems such as curvature of the signal recording pattern on the magnetic tape, are not taken into account.

In addition, in a rotary head cylinder device with a middle cylinder configuration in which the upper and lower cylinders are fixed and a magnetic head is mounted, the magnetic tape runs on the fixed shaft with the Niji cylinder and lower cylinder fixed, and the rotation of the middle cylinder causes the magnetic tape to run. Since the tape scraping phenomenon caused by the head occurs, problems such as bending of the signal recording pattern on the magnetic tape are not considered.

Therefore, with the above-mentioned prior art, high-quality signal recording and reproduction is significantly hindered.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to realize a rotating head cylinder device capable of recording and reproducing high-quality signals.

1 [Means for Solving the Problems] In order to achieve the above object, (1) the linearity of the tape running guide section, which has a predetermined inclination on the outer circumferential surface of the lower cylinder and is arranged in a spiral pattern, The highest point is at the end of winding, and the lowest point is at the center near the center during winding.Furthermore, the near end of the magnetic tape winding has a negative slope with respect to the running direction, and the near end of the winding has a positive slope. The magnetic tape is formed into a V-shape so that the magnetic tape has a height difference of 3 μm or more between the start and end of winding and the lowest point during winding.

Furthermore, (2) the shape of the tape running guide portion in the radial direction of the lower cylinder is configured to be inclined lower toward the inner circumferential side than the outer circumferential side.

[Function] That is, in the upper rotation cylinder device and the middle rotation cylinder device, the linearity of the magnetic tape arranged on the outer peripheral surface of the lower cylinder 5 reaches its highest point at the beginning and end of winding the magnetic tape.
During winding, the near tuft at the center reaches the lowest point, and the magnetic tape winding start 8-near tuft has a negative inclination with respect to the running direction, and the near tuft at the end of winding has a positive inclination at the tape running guide section 13. applies a downward force to the magnetic tape 17 running at a constant speed. This is because the width regulation guides 21 and 22 cause the magnetic tape 17 to follow the tape running guide section 13 at the beginning and end of tape winding, so that even during tape winding, the downward component of the force in the running direction that accompanies tape running is suppressed. It is possible to reduce the raking force exerted on the magnetic tape 17 by the magnetic head 4 as the upper cylinder 3 rotates at high speed.

In addition, the tape running guide portion 13 has a shape in the radial direction of the lower cylinder that is inclined lower toward the inner circumferential side than the outer circumferential side.
It is possible to apply a downward component of the tape regulating force to the magnetic tape 17 and to reduce the force applied to the magnetic tape 17 by the magnetic head 4 as the upper cylinder 3 rotates at high speed. Furthermore, fluctuations in the lower cylinder radial direction of the magnetic tape 17 due to running can be suppressed, and stable head 9-0 touch performance can be ensured.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of an upper rotary head cylinder configuration in a rotary head cylinder device of the present invention, FIG. 2 is a cross-sectional view of a middle rotary head cylinder configuration in a rotary head cylinder electric manufacturing device of the present invention, and FIG. FIG. 4 is a schematic diagram of the positional relationship between the magnetic tape and the running guide section in the rotary head cylinder device of the present invention, and FIG. 6 is a diagram illustrating an embodiment of the tape running guide section in the rotary head cylinder device of the present invention, and FIG. FIG. 3 is a sectional view of a tape running guide section in the rotary head cylinder device of the invention.

In the figure, 1 is the rotating shaft, 7.9.14.15 is the bearing,
2 is a rotating disk, 3 is an upper cylinder, 4 is a magnetic head,
5 is a lower cylinder, 6 is a fixed side rotary transformer, 8 is a rotating side rotary transformer, 10 is a motor, 11 is a plurality of grooves, 12 is a tape running surface, 13 is a tape running guide part, 1
Reference numeral 6 indicates a medium cylinder, and reference numeral 17 indicates a magnetic tape.Next, the operation of this embodiment will be explained.

First, in FIG. 3, a rotary head cylinder device 18 and a magnetic tape 17 in a signal recording/reproducing device such as a VTR are shown.
, inclined guide roller 19.20, and width regulation guide 2
1.22 shows a configuration diagram of a magnetic tape running system. The magnetic tape 17 is wound around the rotary head cylinder device 18 by an inclined guide roller 19.20 and is run at a predetermined speed. 20
, width regulating guides 21, 22, etc., and the mutual relationship between them delicately determines the stability of tape running.

Next, the rotary head cylinder device will be explained, including FIG. 1. As is well known, in order to record signals on a normal magnetic tape, the upper cylinder 3 to which the magnetic head 4 is attached is rotated at high speed in the upper rotary head cylinder device 11-18, and the magnetic tape 17 is transferred to the rotary head cylinder device 18. (For a 1/2" high-definition VTR, wrap it around the cylinder device with a diameter of φ76.
(There is a 16" winding.), and a helical scan method is used in which recording is performed on the magnetic tape 17 at a predetermined inclination angle.

That is, the magnetic tape 17 is connected to the rotary head cylinder device 1.
There is a need for a cylinder device that has a structure that reduces the running surface of the upper cylinder 3 of 8, the raking force against the magnetic tape 17 by the magnetic head 4, and the accompanying phenomenon such as tape vibration of the running system in general. . A tape running guide section 13 having a predetermined inclination angle (θ) is provided on the outer peripheral surface of the lower cylinder 5 of the rotating head cylinder device 18, and the magnetic tape 17 is run along the tape running guide section 13. It is.

That is, in the upper rotating head cylinder apparatus shown in FIG.
has a predetermined angle (0) on the outer circumferential surface of the magnetic tape, and its linearity reaches its highest point at the beginning and end of winding the magnetic tape, and its lowest point at the central near chamber during winding of the magnetic tape; Near the beginning of winding, it has a negative slope with respect to the running direction,
Near the end of winding, the tape running guide part 1 has a positive slope.
3, the magnetic tape 17 is inserted into the tape running guide section 1 at the entry side of the rotary head cylinder device.
3, started running at a slightly steeper angle than the prescribed angle,
By giving the magnetic tape 17 a vertically downward component of force at a predetermined angle, it is possible to reduce the tape scraping phenomenon caused by the rotation of the upper cylinder 3. Also, in the exit part,
The magnetic tape 17, which attempts to run at an angle slightly steeper than a predetermined angle against the tape scraping force, is made to run along a predetermined angle to prevent the recorded pattern from bending.

Next, FIG. 2 shows a second embodiment of a lower cylinder having a tape running guide section of the present invention in a rotary head cylinder device of a medium rotation cylinder type.

In order to regulate the position of the magnetic tape 7 while it is running, it has a predetermined angle (O), and the linearity is at its highest at the beginning and end of the magnetic tape winding, and during the magnetic tape winding,
The lower cylinder 5 is provided with a tape running guide section 13, which is the lowest point in the near center area, and has a negative slope with respect to the running direction, and a positive slope near the end of the winding direction.
The central shaft 1, which is rotatable via a bearing 7.9, is rotated by a motor 10. An intermediate cylinder 16 equipped with a magnetic head 4 coupled and held via a disk 2 fixed to the central shaft 1 is rotated by the drive of a motor 10, thereby performing magnetic recording on a magnetic tape 21. On the other hand, a bearing 14 is located at the upper part of the middle cylinder 16 and is attached to the central shaft 1.
．． The upper cylinder 3 held via the rotation stopper 2
3, it is connected and held to the lower cylinder 5 so as not to receive the rotational force of the central shaft 1.

Therefore, the magnetic tape 17 starts running at an angle slightly steeper than a predetermined angle along the tape running guide section 13 provided on the outer surface of the lower cylinder 5, and the magnetic tape 17 starts to run at an angle slightly steeper than the predetermined angle. It has a force with a directional component, and it is possible to reduce the tape scraping phenomenon caused by the rotation of the upper cylinder 3. In addition, at the exit side, the magnetic tape 17, which is trying to run at an angle slightly steeper than a predetermined angle against the tape scraping force, is caused to run along a predetermined angle, thereby preventing the recorded pattern from bending. are doing.

FIG. 4 shows a schematic diagram of the positional relationship between the magnetic tape and the tape running guide in the rotary head cylinder device of the present invention. Part (a) of the figure shows normal tape running, and part (b) shows tape running according to the present invention.
During tape running in a normal rotary head cylinder device, the magnetic tape 17 is slightly lifted from the straight line of the tape running guide section 13 at a predetermined angle due to the influence of the tape scraping force of the rotating magnetic head 4 at the center during winding. I'm running at a snail's pace. As a result, 15- the magnetic tape 17 has a flying height above the tape running guide section 13; This causes the signal 1- recorded on the magnetic tape.
This causes the rack pattern to bend.

Therefore, by setting the linearity of the tape running guide part 13 to the lowest point near the central part during winding of the magnetic tape, as shown in FIG. Since the tape travels, the tape travel guide section 1 of the magnetic tape 17
The flying height from 3 is less than normal.

FIG. 5 shows a comparison diagram between a conventional track pattern recorded on the magnetic tape 17 and the present invention.

(a) shows a signal recording pattern for normal tape running, in which a track bending amount H8 occurs due to the influence of the above-mentioned tape flying height. On the other hand, (b) shows a signal recording pattern due to tape running according to the present invention. , the magnetic tape 17 is given an inclination angle so that it bends in the opposite direction to the normal bending direction.

As a result, the track bending amount H according to the present invention has a small value compared to the normal track bending amount H8.

In particular, 1/2-inch high-definition VTRs require a very strict standard value for the amount of track curvature of 4 μm pp or less, and optimization of the amount of track curvature according to the present invention is essential.

FIG. 6 is a diagram showing an embodiment of the tape running guide section 13 in the rotary head cylinder device of the present invention. The horizontal straight line in the figure is the conventional tape running guide section 13 having a predetermined angle.

Figure (a) shows a configuration in which the linearity of the tape running guide section 13 reaches its lowest point in the middle of tape winding, and is a straight line from the entry side to the middle of winding and from the middle of winding to the exit side.

In FIG. 6, (b) is almost the same as (a), but the lowest part of the tape winding has a smooth curve 17-18-, and the magnetic tape 17 is unstable due to floating in the middle of the winding. In order to eliminate running, a curved portion is arranged near the tape flying height.

In addition, although FIG. 3(c) is almost the same as FIG. The structure is designed to prevent tape damage caused by sudden changes. Figure (d) is almost the same as (a), but the inclination angle of the straight line on the tape entry side and the tape exit side is made steeper to reduce the effect of the raking force until the tape is wound. It has a two-stage configuration. Furthermore, FIG. 1(e) is a further development of FIG. 1(b), in which the entire tape running guide section 13 is made into a smooth curve, and the magnetic tape 17 running along the tape running guide section 13 is subjected to a sudden direction changing force. The configuration is such that it cannot be added.

Furthermore, considering the current state of high-precision machining, the current NC machining accuracy has been completed in a form close to this configuration.

Figure (f) is almost the same as (a), but a straight line slope is provided at the tape entrance and exit sides, but during tape winding, the slope angle is equivalent to the conventional predetermined slope angle, and the magnetic field of the present invention is The configuration is such that the influence on the tape 17 is reduced as much as possible.

FIG. 7 is a sectional view of the tape running guide section 13 in the rotary head cylinder device of the present invention.

Figure (a) is a cross-sectional view of a conventional tape running guide section 13, in which the tape scraping force has no effect on the radial direction of the lower cylinder 5.

However, FIG. (b) is a sectional view of the tape running guide part 13 of the present invention, and shows that the shape of the lower cylinder in the radial direction is inclined lower toward the inner circumferential side than the outer circumferential side, or A part of is at the same height, and the outer circumference is as follows:
The tape running guide part 13 is configured to be inclined lower toward the inner circumferential side than the outer circumferential side. It is possible to reduce the force exerted on the magnetic tape 179- by the magnetic tape 179-.

Furthermore, fluctuations in the lower cylinder radial direction of the magnetic tape 17 due to running can be suppressed, and stable head touch performance can be ensured.

In the embodiment shown in FIG. 6, the tape running guide portion 13 disposed on the outer circumferential surface of the lower cylinder 5 has a shape in the lower cylinder radial direction that is inclined lower toward the inner circumferential side than the outer circumferential side. It is possible to configure this structure, and there is an effect of further reducing the raking force.

[Effects of the Invention] As detailed above, in both the upper rotation and middle rotation types of the rotary head cylinder device according to the present invention,
The lower cylinder, which has a guide for stable running of each magnetic tape, has a predetermined angle, and its linearity reaches its highest point at the beginning and end of winding the magnetic tape. The tuft near the start of winding, which is the lowest point at , has a negative slope with respect to the running direction, and the tuft near the end of winding has a positive slope. By configuring the tape running guide section so that the shape in the cylinder radial direction is inclined lower toward the inner circumferential side than the outer circumferential side, the force for scraping up the magnetic tape due to the rotation of the magnetic head mounting cylinder is reduced, and The force to force the tape to run along the tape running guide is strengthened, and the magnetic tape can run stably.

Therefore, as a result of the above, even if the tape tension is weakened, the magnetic tape will more easily follow the tape running guide, and the reduction in tape tension will reduce the tape running load, reduce tape damage, and reduce wear on the magnetic head. Since a longer service life can be obtained, it is possible to provide a magnetic recording and reproducing device having a rotating head cylinder device that can achieve high quality signal recording and reproducing.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a rotary head cylinder device showing an embodiment of the present invention, Fig. 2 is a cross-sectional view showing another embodiment of the present invention, and Fig. 3 is a cross-sectional view of a rotary head cylinder device showing an embodiment of the present invention. FIGS. 4, 5, 6, and 7 are block diagrams showing a tape running system including a rotating head cylinder device, showing still other embodiments of the present invention. DESCRIPTION OF SYMBOLS 1...Rotating shaft, 7,9,14,1.5...Bearing, 2...Rotating disk, 3...Upper cylinder, 4...Magnetic head, 5...Lower cylinder, 6 ... Fixed side rotary transformer, 8... Rotating side rotary transformer, 10... Motor, 12... Tape running surface, 13... Tape running guide section, 16... Middle cylinder, 17...・Magnetic tape, 23... Rotation stopper 3- FIG. 4(b') Tiff of the present invention. Man 50 (1) Completion (b) Invention 1-y Tree No. 60 (0-) Non-Q kesa tape yinte hope (b') (C') (d”) (e) (-F ) Tape running plan part No. 70 (0-) Yuguchi tying tape 0 Inspection tape. Tape running guide lower part) (b) Oshi Tadatsuki tie. ゞ13 Tape running guide part

Claims (1)

[Claims] 1. The magnetic tape (17) is guided as it travels, and with respect to standard linearity, the highest point is at the start and end of winding the magnetic tape, and the lowest point is near the center during winding. Furthermore, the near end of the magnetic tape winding has a negative inclination with respect to the running direction, and the near end of winding has a positive inclination. A lower cylinder (5) provided on the outer peripheral surface, and bearings (7, 9) held in the center of the lower cylinder (5).
); a disk (2) fixed to the rotating shaft (1); and a magnetic head (4) connected to the disk (2) and attached to its outer periphery. an upper cylinder (3) fixed to the lower cylinder (5) and arranged concentrically with respect to the lower cylinder (5); Upper cylinder (3) and the above magnetic head (4)
A rotary head cylinder device comprising: a cylinder motor (10) for rotationally driving a cylinder motor (10); 2. Guide the magnetic tape (17) as it travels, and with respect to standard linearity, the highest point is at the beginning and end of winding the magnetic tape, the lowest point is near the center during winding, and the lowest point is the beginning of winding the magnetic tape. The near tuft has a negative inclination with respect to the running direction, and the near tassel at the end of winding has a tape running guide part (13) with a positive inclination, which is spirally provided on its outer peripheral surface at a predetermined inclination angle. A lower cylinder (5), a central shaft (1) disposed at the center of the lower cylinder (5), and a magnetic head (4) are fixed to the outer peripheral edge of the lower cylinder (5). A middle cylinder (16) arranged concentrically above the central axis (1), and a lower cylinder (16) above the middle cylinder (16).
5) and arranged concentrically on the middle cylinder (16),
and a cylinder motor (10) connected to at least the middle cylinder (16) and configured to rotationally drive at least the middle cylinder (16) and the magnetic head (4). A rotating head cylinder device characterized by its configuration. 3. The tape running guide part (13) has a linear shape of the surface that guides the running of the magnetic tape (17) to be a smooth downward convex curve with a slope changing in the center during winding of the magnetic tape, and a predetermined shape. The cylinder is arranged spirally on the outer peripheral surface of the lower cylinder (5) with an inclination of
The rotary head cylinder device according to claim 1 or claim 2. 4. The tape running guide section (13) is configured such that the linear shape of the surface that guides the running of the magnetic tape (17) is sloped so that the center portion is the lowest point only at the beginning and end of winding the magnetic tape, and The rotating head according to claim 1 or 2, wherein the central near chamber has a predetermined inclination as a straight line and is spirally arranged on the outer peripheral surface of the lower cylinder (5) during winding. cylinder device. 5. The tape running guide section (13) has a linear shape of the surface that guides the running of the magnetic tape (17) so that the linear shape has a predetermined inclination only at the beginning and end of winding the magnetic tape, and the linear shape of the surface that guides the running of the magnetic tape (17) is a straight line with a predetermined inclination only at the beginning and end of winding the magnetic tape. The rotary head cylinder device according to claim 1 or 2, wherein the rotary head cylinder device is provided with a configuration in which the lower cylinder (5) is arranged in a spiral manner on the outer circumferential surface of the lower cylinder (5) with an inclination to reach the lowest point. 6. The tape running guide section (13) adjusts the linear shape of the surface that guides the running of the magnetic tape (17) so that during magnetic tape winding, the winding starts and ends at the lowest point at the center. A straight line having a steep slope, and a straight line having a slope close to a gentle predetermined slope in the middle and near winding chambers, and is spirally arranged on the outer circumferential surface of the lower cylinder (5). The rotary head cylinder device according to claim 1 or claim 2. 7. The tape running guide part (13) slopes the linear shape of the surface that guides the running of the magnetic tape (17) so that the lowest point is at the center during winding of the magnetic tape, and 3. The rotation according to claim 1 or 2, wherein the rotor has a height difference of 3 μm or more between the point and the highest point on the entry side and the exit side, and is arranged in a spiral shape on the outer peripheral surface of the lower cylinder (5). Head cylinder device. 8. The running guide section (13) has a configuration in which the shape of the surface of the lower cylinder (5) that guides the running of the magnetic tape (17) in the radial direction is inclined lower toward the inner circumferential side than the outer circumferential side; Alternatively, a part of the inner circumferential side is at the same height, and the outer circumferential side is inclined lower toward the inner circumferential side than the outer circumferential side, and is arranged in a spiral shape on the outer circumferential surface of the lower cylinder (5). Claim 1 comprising:
Or the rotary head cylinder device according to claim 2.