JP2004164790A - Rotating head drum device and recording / reproducing device using the same - Google Patents

Abstract

A recording / reproducing apparatus provides a technique capable of securing good tape / head contact properties and stable tape running properties.
A rotary head drum device has an upper drum and a lower drum each having a fixed structure, a middle drum of a rotary structure is arranged between the upper drum and the lower drum, and a head is mounted on the middle drum. So that the outer diameter of each of the drums is relatively large such that the upper drum has a maximum dimension, the lower drum has a minimum dimension, and the middle drum has an intermediate dimension.
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotary head drum device for recording or reproducing a signal on or from a tape-shaped recording medium by rotating a head, and a recording / reproducing device using the same.
[0002]
[Prior art]
2. Description of the Related Art In a conventional recording / reproducing apparatus such as a VTR, a video camera, and a tape streamer, a magnetic tape is obliquely wound around a rotating surface of a rotating drum, and the magnetic tape is obliquely scanned by a plurality of magnetic heads provided on the rotating drum, and a signal is read. The helical scan method for recording or reproducing the data is generally adopted. Under these circumstances, along with the trend toward longer time, higher image quality, and digitalization, an increase in the amount of recorded information (higher density) and a higher data transfer speed are required. It is in the direction of increasing the relative speed between. When the number of rotations of the drum increases, air on the surface of the rotating drum is caught between the magnetic tape and the state of contact between the tape and the head (hereinafter, referred to as a tape-head contact) deteriorates, which affects recording / reproducing performance. Further, the force applied to the tape in the head scanning direction (above the tape width in a general VTR) increases, and there is a concern that the tape running performance may be affected. As a technique for solving the above problem, for example, there are techniques described in JP-A-7-182740 (Patent Document 1) and JP-A-9-320153 (Patent Document 2). Japanese Patent Application Laid-Open No. 7-182740 discloses a medium drum rotation method in which only the width of a part including the head of the upper rotating drum is rotated in order to reduce the surface area of the drum rotating portion as much as possible. A drum structure for rotating only the head is described. Japanese Patent Application Laid-Open No. 9-320153 discloses that a tape head contact is formed by processing a part of the upper fixed drum and deforming the tape to impart a tension distribution in the width direction to the tape, taking advantage of the features of the upper fixed drum structure. There is described a technique for maintaining good performance and ensuring stabilization of a recording / reproducing waveform.
[0003]
[Patent Document 1]
JP-A-7-182740 (paragraph numbers 0017 and 0019, FIGS. 1 and 3)
[Patent Document 2]
JP-A-9-320153 (paragraph numbers 0018 to 0025, FIGS. 1 and 2)
[0004]
[Problems to be solved by the invention]
In the configuration using a rotating drum among the above-mentioned prior arts, the air film thickness between the drum and the tape increases on the tape entry side of the drum, and the contact surface pressure at the tape head contact decreases. As a result, output reproduction and fluctuation are caused in the drum entrance side and drum exit side portions of the reproduced output waveform, resulting in a waveform in which the head output is degraded. FIG. 6 shows an example of a deterioration waveform of the head output. In FIG. 6, 23 is a normal waveform, and 23 'is a deteriorated waveform. Further, in the configuration using the upper fixed drum, the effect of suppressing the tape floating is enhanced, but in order to cope with various kinds of tapes including ultra-thin tape, it is still insufficient in securing the tape head contact property. It is believed that there is. In other words, even if the tape entry side of the drum is set to the proper head-tape contact condition, the head-tape contact condition deviates from the appropriate condition on the drum exit side, and as a result, the tape deformation in the head portion becomes large. In some cases, an appropriate contact surface pressure cannot be obtained in the gap portion of the head due to over-smoothing. If the necessary tape-to-head contact cannot be ensured, the output waveform of the head will be like the deteriorated waveform 23 'in FIG. In the deteriorated waveform 23 ', the deteriorated portion at the left end is due to the fact that an appropriate contact surface pressure cannot be obtained in the gap portion of the head on the tape entry side, and the deteriorated portion on the right end is the gap of the head on the tape exit side. This is because an appropriate contact surface pressure cannot be obtained at the part. Further, as shown in FIG. 7, in the conventional tape running system using the tape control technology by the flange portion (upper flange) 6a of the guide roller 6, an excessive tape control force or an excessive force between the guide roller 6 and the inclined pin 5 is required. It is easy to cause twisting of the tape path between the tapes, which may cause tape damage due to the curl-shaped local deformation 1c at the upper end 1a of the tape, particularly when the vehicle travels repeatedly in the forward and reverse directions. is there. When this occurs, the tape running in the drum section becomes unstable, and the recording / reproducing performance is significantly deteriorated.
An object of the present invention is to provide a recording / reproducing apparatus capable of (1) ensuring a predetermined tape-to-head contact property even when an ultra-thin tape or the like is used as a recording medium in view of the state of the related art. (2) no tape damage occurs in the tape running system; and (3) stable tape running in the drum section.
An object of the present invention is to provide a technique capable of solving such a problem.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, according to the present invention, basically, the rotary head drum device has a fixed type structure for the upper drum and the lower drum, and a rotary type drum structure between the upper drum and the lower drum. A drum is arranged and a head is mounted on the middle drum so as to be rotatable, and the outer diameter of each drum is set such that the upper drum is the largest, the lower drum is the smallest, and the middle drum is the middle. . Specifically, (1) As a rotary head drum device, a fixed lower drum having leads for guiding a tape-shaped recording medium formed on the outer periphery, and a fixed lower drum for guiding the tape-shaped recording medium together with the fixed lower drum. And a rotating drum mounted with a head and mounted between the fixed lower drum and the fixed upper drum and rotatable about a central axis, wherein an outer diameter L of the fixed lower drum, The outer diameter dimension M of the drum and the outer diameter dimension U of the fixed upper drum satisfy a relationship of L <M <U. (2) In the above (1), the center axis of the upper fixed drum is a predetermined amount in the direction of the medium exit side within the angle range around which the tape-shaped recording medium is wound around the center axis of the rotating drum. An eccentric configuration is used. (3) In the above (2), the center axis range of about ^{2 × 10 -6 m~8 × 10 -6} m eccentricity of the upper fixed drum. (4) In the above (1), the outer peripheral surface of the upper fixed drum is configured to protrude from the outer peripheral surface of the rotating drum within an angle range in which the tape-shaped recording medium is wound. (5) As a recording / reproducing apparatus for recording and / or reproducing a signal on / from a tape-shaped recording medium using a rotary head drum device, leads for guiding the tape-shaped recording medium are formed on the outer periphery. A fixed lower drum, a fixed upper drum that guides the tape-shaped recording medium together with the fixed lower drum, and a head mounted and disposed between the fixed lower drum and the fixed upper drum and rotatable around a central axis. And an outer diameter dimension L of the fixed lower drum, an outer diameter dimension M of the rotating drum, and an outer diameter dimension U of the fixed upper drum satisfy a relationship of L <M <U. The rotary head drum device includes a rotary head drum device, and a guide member disposed before and after the rotary head drum device to guide the tape-shaped recording medium. A medium conveying means for traveling along a predetermined path through the outer peripheral portion of the arm unit, a configuration in which a signal processing means for performing signal processing of the reproduced signal or a recording signal to the head from the head. (6) In the above (5), the rotary head drum device may be configured to retreat the medium within an angle range in which the center axis of the upper fixed drum is wound around the center axis of the rotating drum and the tape-shaped recording medium is wound. It is configured to be eccentric by a predetermined amount in the side direction. (7) In (6), the eccentricity of the central axis of the upper stationary drum to a range of about ^{2 × 10 -6 m~8 × 10 -6} m. (8) In the above (5), the rotary head drum device may be configured such that an outer peripheral surface of the upper fixed drum projects from an outer peripheral surface of the rotating drum within an angle range in which the tape-shaped recording medium is wound. And
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a mechanism section of a recording / reproducing apparatus equipped with a rotary head drum device of the present invention. The tape cassette is indicated by a virtual line for convenience of explanation. FIG. 1 shows a state at the time of completion of tape loading, and it is assumed that a tape as a recording medium is spirally wound in a predetermined angle range with respect to a rotary head drum device. This embodiment shows an example of an M-loading type tape running system generally employed in a VHS type VTR. The recording / reproducing apparatus includes, in addition to the mechanism section, a signal processing circuit or the like as signal processing means for performing signal processing of a reproduction signal from the head of the rotary head drum device or a recording signal to the head.
In FIG. 1, 1 is a tape such as a magnetic tape as a tape-shaped recording medium, 2 is a rotary head drum device, 3 is a tape cassette, 4 is a supply reel in the tape cassette 3, 5, 9 are inclined pins in a tape running system, 6, 7 and 10 are guide rollers, 8 is a tension control guide, 11 is a capstan, 12 is a tape guide, 13 is a pinch roller, 14 is a take-up reel in the tape cassette 3, and 15 is a mechanical chassis. The rotating head drum device 2 includes a fixed upper drum, a fixed lower drum, a middle rotating drum on which a head is mounted, and a drum driving motor (not shown) for driving the middle rotating drum to rotate. The capstan 11 is driven by a capstan motor (not shown). The supply reel 4 and the take-up reel 14 are also driven by a reel driving motor (not shown). In such a configuration, the tape 1 fed from the supply reel 4 of the tape cassette 3 is wound on the take-up reel 14 in the tape cassette 3 via the tape running path by the tape running system and the rotary head drum device 2. . On the tape entry side of the rotary head drum device 2, a tape traveling path is formed by a tape traveling system as a medium traveling means such as the inclined pin 5, the guide rollers 6, 7 and the tension control guide 8. On the tape exit side of the rotary head drum device 2, a tape traveling path is formed by a tape traveling system as a medium traveling means such as an inclined pin 9, a guide roller 10, a capstan 11, and a tape guide 12. At the time of recording or reproduction, the tape 1 is held between the capstan 11 and the pinch roller 13, and the capstan 11 rotates at a constant speed, so that the tape 1 fed from the supply reel 4 keeps a predetermined traveling path. It travels at a speed and is wound on the take-up reel 14. In the case of this embodiment, the rotary head drum device 2 rotates in the direction of arrow A, and the tape 1 runs in the direction of arrow B in the normal recording / reproducing mode, and runs in the direction of arrow C in the reverse running mode (rewinding or the like). . In addition, since the M-loading type tape running system is used, one inclined pin 5, 9 is provided on each of the tape entry side and the tape exit side, and in order to regulate the tape running height in a certain range in the vicinity thereof. Guide rollers 6 and 10 are provided.
[0007]
FIG. 2 is an expanded side view of the tape traveling system of the recording / reproducing apparatus of FIG. 1 when viewed from the direction of arrow G in FIG.
In FIG. 2, 1a is the upper end of the tape 1, 1b is the lower end, 5 and 9 are inclined pins, 6 and 10 are guide rollers, 6a and 6b are upper and lower flanges of the guide roller 6, respectively, and 10a and 10b are guides. The upper flange and lower flange of the roller 10, 16 is a fixed upper drum, 17 is a rotating drum, 18 is a recording and reproducing head mounted on the rotating drum 17, 19 is a fixed lower drum, and 20 is a tape 1 U is the outer diameter of the fixed upper drum 16, M is the outer diameter of the rotating drum 17, and L is the outer diameter of the fixed lower drum 19 for guiding traveling. . A plurality of heads 18 are mounted on the drum 17 during rotation. The outer diameter dimension of the fixed lower drum 19, the outer diameter dimension M of the rotating drum 17, and the outer diameter dimension U of the fixed upper drum 16 are set to have a relationship of L <M <U. In such a configuration, when the drum 17 is rotating during rotation and the tape 1 is traveling by the tape traveling system, in the direction of arrow H on the tape entry side of the rotary head drum device 2 and in the direction of arrow I on the tape exit side. Then, a transition force (F direction) for regulating the tape is generated, and as a result, the height of the lower end 1b of the tape 1 with respect to the lead 20 is regulated stably. As a result, the tape floating on the tape exit side in the rotary head drum device 2 can be suppressed, and the tape running can be stabilized. In a system using the tape 8mm width, outer diameter M of the rotating drum 17 is about 5 × is ^{10 -6 m~15} × ¹⁰ -6 m larger the outer diameter dimension L of the fixed lower drum 19, the outer diameter dimension U of the stationary upper drum 16 is made larger to about ^{15 × 10 -6 m~25 × 10 -6} m with respect to the outer diameter dimension L of the fixed lower drum 19. In the guide rollers 6, 10, the upper end 1a of the tape 1 does not contact the upper flanges 6a, 10a for regulating the tape width (parts c and d), and the lower end 1b of the tape 1 also regulates the tape width. So as not to contact with the lower flanges 6b, 10b of the housing. As a result, the upper end 1a of the tape is unrestricted from the upper flanges 6a and 10a. Therefore, the tape 1 does not undergo out-of-plane deformation such as curling, and in particular, occurrence of tape damage at the upper end of the tape in a mode such as repeated running can be suppressed.
[0008]
3 to 5 are explanatory diagrams of the improvement of the head / tape contact performance. 3 is a side view of the rotary head drum device 2 of FIG. 1, FIG. 4 is an enlarged view of a head / tape contact portion (a portion) on the tape entry side in FIG. 3, and FIG. 5 is a tape exit side in FIG. FIG. 4 is an enlarged view of a head / tape contact portion (portion b) of FIG.
In FIG. 3, the rotating drum 17 is provided substantially coaxially with the center axis 19a of the fixed lower drum 19, and the center axis 16a of the fixed upper drum 16 is positioned on the tape exit side (arrow E) with respect to the center axis 19a of the fixed lower drum 19. ) Is provided eccentrically by α in the direction. As a result, the amount of protrusion of the fixed upper drum 16 with respect to the rotating drum 17 becomes larger on the tape exit side than on the tape entrance side. For example, in a system using tape 8mm width, when the head projecting quantity from the rotating drum 17 peripheral surface of 20 × ¹⁰ -6 m~22 × about ^{10 -6} m, the above eccentricity α is 2 × 10 ^{- It} is preferably about ⁶ m to 8 × 10 ⁻⁶ m.
[0009]
FIG. 4 is an enlarged view of a head / tape contact portion (a portion) on the tape entry side in FIG. A broken line 16 'indicates the position of the fixed upper drum 16 when the lower fixed drum 19, the rotating drum 17, and the fixed upper drum 16 are arranged substantially coaxially. When the respective drums are arranged substantially coaxially, the profile in the width direction of the tape 1 becomes like the profile 21 ′ shown in FIG. 4, and the contact state between the tape 1 and the head 18 at the upper part of the head 18 is not good. Become stable. This leads to the deterioration of the head output waveform as shown in FIG. On the other hand, the center axis of the fixed upper drum 16 is eccentric to the center axis of the fixed lower drum 19 by α in the tape retreating side direction as shown in FIG. 3, and the fixed upper drum 16 is arranged at the solid line position in FIG. Then, the profile in the width direction of the tape 1 becomes like a profile 21 shown by a solid line in the figure. For this reason, the contact state between the head 18 and the tape 1 is kept good, and a good reproduced output waveform 23 is secured as the head output on the tape entry side. In this embodiment, even after the center axis of the fixed upper drum 16 is eccentric with respect to the center axis of the fixed lower drum 19, the outer peripheral surface of the fixed upper drum 16 protrudes from the outer peripheral surface of the rotating drum 17. However, the outer peripheral surface of the fixed upper drum 16 does not necessarily have to protrude, and the outer peripheral surfaces of both may be substantially in a state of being coincident with each other.
[0010]
FIG. 5 is an enlarged view of the head / tape contact portion (portion b) on the tape exit side in FIG. A broken line 16 'indicates the position of the fixed upper drum 16 when the lower fixed drum 19, the rotating drum 17, and the fixed upper drum 16 are arranged substantially coaxially. In a state where the respective drums are arranged substantially coaxially, the width profile of the tape 1 is such that the tape wrapping deformation becomes too large at the central portion of the head 18 as shown by a profile 22 'shown by a broken line, and the tape 1 and the head 1 18 makes the contact state unstable. Therefore, also in this case, the waveform of the head output is deteriorated as shown in FIG. This phenomenon is particularly noticeable in thin tapes. On the other hand, the center axis of the fixed upper drum 16 is eccentric with respect to the center axis of the fixed lower drum 19 by α in the tape retreating side direction as shown in FIG. 3, and the fixed upper drum 16 is arranged at the solid line position in FIG. Then, the profile in the width direction of the tape 1 on the tape exit side is in a state like a profile 22 indicated by a solid line in the drawing. For this reason, even on the tape exit side, the contact state between the head 18 and the tape 1 is kept good, and a good reproduced output waveform 23 is secured.
[0011]
According to the configuration of the above embodiment, even when an ultra-thin tape or the like is used in the rotary head drum device or the recording / reproducing device, stable tape running can be achieved while maintaining good contact between the head 18 and the tape 1. . Further, since it is not necessary to control the width of the upper end of the tape at the flange portions of the guide rollers 6, 10, the occurrence of tape damage can be suppressed. As a result, a stable head output without waveform deterioration can be obtained.
[0012]
In the configuration of the above embodiment, the running of the tape 1 in the tape running system is performed by the capstan 11. However, the present invention is not limited to this. For example, the running drive of the tape is performed by directly driving a reel. A system configuration may be used. Further, the configuration of the tape guide in the tape traveling system is not limited to the configuration of the above-described embodiment. For example, a guide roller having a configuration different from that of the above-described embodiment may be used.
[0013]
【The invention's effect】
According to the present invention, good contact between the head and the tape can be obtained in the rotary head drum device or the recording / reproducing device. Stable tape running becomes possible. A stable head output without waveform deterioration can be obtained. The occurrence of tape damage is also suppressed.
[Brief description of the drawings]
FIG. 1 is a diagram showing a recording / reproducing apparatus equipped with a rotary head drum device of the present invention.
FIG. 2 is a side view of the recording / reproducing apparatus of FIG.
FIG. 3 is a side view of the rotary head drum device of FIG. 1;
FIG. 4 is an enlarged view of a head / tape contact portion on the tape entry side in FIG. 3;
FIG. 5 is an enlarged view of a head / tape contact portion on a tape exit side in FIG. 3;
FIG. 6 is an explanatory diagram of a deterioration state of a head output.
FIG. 7 is an explanatory diagram of tape deformation.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Tape, 2 ... Rotary head drum device, 3 ... Tape cassette, 4 ... Supply reel, 5, 9 ... Inclined pin, 6, 7, 10 ... Guide roller, 6a ... Upper flange of guide roller 6, 10a ... Guide roller 10 upper flange, 6b lower flange of guide roller 6, 10b lower flange of guide roller 10, 8 tension control guide, 11 capstan, 12 tape guide, 13 pinch roller, 14 take-up reel, Reference numeral 15: mechanical chassis, 16: fixed upper drum, 16a: center axis of fixed upper drum, 17: rotating drum, 18: head, 19: fixed lower drum, 19a: center axis of fixed lower drum, 20: lead, 21 , 22 ... tape profile.

Claims (8)

A rotary head drum device that rotates a head to record or reproduce a signal on a tape-shaped recording medium,
A fixed lower drum in which leads for guiding the tape-shaped recording medium are formed on the outer periphery,
A fixed upper drum for guiding the tape-shaped recording medium together with the fixed lower drum,
A rotating drum on which the head is mounted and which is disposed between the fixed lower drum and the fixed upper drum and is rotatable around a central axis;
And the outer diameter L of the fixed lower drum, the outer diameter M of the rotating drum, and the outer diameter U of the fixed upper drum satisfy a relationship of L <M <U. A rotary head drum device characterized by the above-mentioned. 2. The upper fixed drum according to claim 1, wherein a center axis of the upper fixed drum is eccentric with respect to a center axis of the rotating drum by a predetermined amount in a retreating direction of the medium within an angle range around which the tape-shaped recording medium is wound. 3. Rotary head drum device. Rotary head drum apparatus according to claim 2 eccentricity of the center axis of the upper stationary drum is in the range of about ^{2 × 10 -6 m~8 × 10 -6} m. The rotary head drum device according to claim 1, wherein the upper fixed drum has a configuration in which an outer peripheral surface protrudes from an outer peripheral surface of the rotating drum within an angle range in which the tape-shaped recording medium is wound. A recording and reproducing apparatus that performs one or both of recording and reproducing of a signal on a tape-shaped recording medium using a rotary head drum device,
A fixed lower drum having leads for guiding the tape-shaped recording medium formed on the outer periphery thereof, a fixed upper drum for guiding the tape-shaped recording medium together with the fixed lower drum, and a head mounted with the fixed lower drum and A rotating drum disposed between the fixed upper drum and a rotatable drum around a central axis, the outer diameter L of the fixed lower drum, the outer diameter M of the rotating drum, and the outer diameter of the fixed upper drum. A rotary head drum device having a configuration in which the diameter dimension U satisfies L <M <U;
A medium traveling device that includes a guide member that is disposed before and after the rotary head drum device and guides the tape-shaped recording medium, and that causes the tape-shaped recording medium to travel along a predetermined path through an outer peripheral portion of the rotary head drum device. Means,
Signal processing means for performing signal processing of a reproduction signal from the head or a recording signal to the head,
A recording / reproducing apparatus characterized by comprising: The rotary head drum device is configured such that a center axis of the upper fixed drum is eccentric with respect to a center axis of the rotating drum by a predetermined amount in a direction toward the medium exit side within an angle range around which the tape-shaped recording medium is wound. The recording / reproducing apparatus according to claim 5, wherein Eccentricity of the center axis of the upper stationary drum, the recording and reproducing apparatus according to claim 6 is in the range of about ^{2 × 10 -6 m~8 × 10 -6} m. 6. The recording apparatus according to claim 5, wherein the rotary head drum device has a configuration in which an outer peripheral surface of the upper fixed drum protrudes from an outer peripheral surface of the rotating drum within an angle range around which the tape-shaped recording medium is wound. Playback device.

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