JP2005259241A - Servo writer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correct a displacement between a tape and a head, and record and reproduce a servo signal with high precision to improve productivity. <P>SOLUTION: A servo writer 10 is provided with; a servo writer base part 10a; a supporting arm 20 in which a head H1, which is supported in cantilever by the base part 10a and located at a free end 20a thereof, is provided position-adjustably to a tape MT; a detection means 30 which detects the position of the edge MT1 of the tape MT in a position adjacent to the head H1; a position adjusting means 40 which adjusts a relative position between the tape MT and the head H1; and a control part 45 which controls the relative position by means of the position adjusting means 40 in accordance with the position of the edge MT1 detected by the detection means 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a servo writer capable of adjusting a relative position between a tape-shaped recording medium such as a magnetic tape and a head for recording or reproducing a servo signal on the tape-shaped recording medium.

In recent years, magnetic tapes used for computer data backup and the like have been improved in linear density to increase the number of data tracks, and in order to accurately read data recorded at high density, A technique is employed in which servo signals are recorded on a plurality of servo bands adjacent to the data track and reproduced.
In a magnetic tape system using such a servo signal, it is necessary to accurately write (record) the servo signal on the magnetic tape, and a servo writer is used as a device for that purpose.

  FIG. 5 is a diagram for explaining the structure around the servo write head in this servo writer. The servo write head 50 has a head surface 50a magnetically coupled to the free end 52a of the support arm 52 attached to the base 51. It is attached toward the recording surface of the tape MT. The support arm 52 has a position adjusting means composed of precision parts for adjusting the position of the servo write head 50 with respect to the magnetic tape MT. The position adjustment means includes a tape width direction adjustment mechanism 53a, a wrap angle adjustment mechanism 53b, an azimuth angle adjustment mechanism 53c, and a turn angle adjustment mechanism 53d. By operating these adjustment knobs, the magnetic tape The relative position of the servo write head 50 with respect to MT is adjusted. As a result, the servo signal is recorded at a predetermined position on the magnetic tape MT.

  In such a technical field, the servo write head side has a fixed structure and the magnetic tape side can be adjusted in position so that the position of the magnetic tape side is adjusted, so that the servo signal can be transmitted in a predetermined manner. There has also been proposed one recorded at a position (see, for example, Patent Document 1).

As described above, servo signal recording is required to be performed at an accurate position of the magnetic tape MT, for example, on the order of microns. Therefore, highly accurate maintenance management is also required. However, in the servo writer, when the magnetic tape MT is actually run and the servo signal is written by the servo write head 50, the vibration of the motor that runs the magnetic tape MT, the vibration from the floor of the work place, the time of the component coupling portion The position of the servo write head 50 may change in units of microns due to the influence of a change in the environment. Therefore, in order to cope with this, conventionally, magnetic development processing is performed at a constant operation cycle, for example, once / day, and position measurement is performed by a comparator or the like to determine whether the servo write head 50 is at a predetermined position. The position deviation was confirmed.
When it is confirmed that a position shift has occurred, the position of the servo write head 50 has been precisely adjusted again.
Japanese Patent Application No. 2001-93211 (paragraphs 0009-0011, FIG. 1)

  However, since the conventional operation for confirming misalignment is complicated and requires labor to perform it frequently, the operation has been determined by determining a certain operation cycle as described above. For this reason, it cannot be determined whether or not a positional deviation has occurred at the time of confirmation.If it is confirmed that a positional deviation has occurred, all products produced after the previous confirmation are servoed. There is a problem in that the product is in a target range in which a product having a poor signal recording is mixed, resulting in poor productivity.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a servo writer that can correct misalignment between a tape and a head, record or reproduce a servo signal with high accuracy, and improve productivity. Is an issue.

A servo writer according to claim 1 of the present invention that has solved the above problems is a servo writer provided with a head for recording or reproducing a servo signal on a running tape, and includes a base portion and a base portion. A support arm that is cantilevered and is provided at a free end so that the head can be adjusted with respect to the tape; and a detecting means for detecting the position of the edge of the tape at a position near the head; ,
A position adjusting unit that adjusts a relative position between the tape and the head; and a controller that controls the relative position by the position adjusting unit according to the position of the edge detected by the detecting unit. It is characterized by that.

According to the first aspect of the invention, since the support arm is cantilevered by the base portion and is provided so that the position can be adjusted, the position of the free end of the support arm can be adjusted, and the tape The position of the head can be adjusted.
Then, the position of the edge of the running tape is detected by the detecting means, and the position adjusting means is driven and controlled by the control unit in accordance with the edge position detected by the detecting means, and the relative position of the head with respect to the tape is adjusted. The Here, a data track such as a servo signal recorded on the tape is recorded at a predetermined position in the width direction of the tape on the basis of the edge of the tape. Based on the adjustment of the relative position of the head with respect to the tape, the servo signal can be accurately recorded at a predetermined position on the tape.

  Further, since the position of the edge is detected in the vicinity of the head, the positional deviation of the tape with respect to the head can be detected almost accurately.

  According to a second aspect of the present invention, in the servo writer according to the first aspect of the present invention, the servo writer further includes a head adjustment portion configured to be able to adjust a facing distance between the base portion and the free end of the support arm. And

  According to the second aspect of the present invention, since the position adjusting means includes the head adjusting portion configured to be able to adjust the facing distance between the base portion and the free end of the support arm, the position adjusting means is driven. Then, the facing distance between the base portion and the free end of the support arm is adjusted, and the position of the head is adjusted to a predetermined position based on the edge of the tape. That is, the position of the head is directly adjusted with reference to the edge of the tape. Thus, the servo signal can be accurately recorded at a predetermined position on the tape.

  According to a third aspect of the present invention, in the servo writer according to the first aspect, the position adjusting means includes a pair of tape guides arranged on both sides of the head along the running direction of the tape. It is characterized by comprising a tape guide adjusting part configured to be position-adjustable in the direction.

  According to the third aspect of the present invention, when the tape guide adjusting portion is driven, the position of the tape guide is adjusted in the tape width direction with respect to the base portion, and the relative position of the tape with respect to the head is determined by this position adjustment. Adjusted to position. In other words, the position of the tape guide is directly adjusted, and the relative position of the tape with respect to the head is adjusted. Thus, the servo signal can be accurately recorded at a predetermined position on the tape.

  According to a fourth aspect of the present invention, in the servo writer according to any one of the first to third aspects, the position adjusting unit is configured such that the position of the edge detected by the detecting unit is a predetermined position. It is characterized in that the drive is controlled when it becomes.

  According to the fourth aspect of the present invention, the position adjusting means is driven and controlled when the edge position detected by the detecting means reaches a predetermined position. When a deviation occurs, it is possible to adjust the position of the head with respect to the tape by driving and controlling the position adjusting means. That is, frequent position adjustment is prevented in a range of misalignment that does not cause product defects. Thereby, management of position adjustment can be simplified.

  According to the present invention, the relative position between the tape and the head can be adjusted, and recording or reproduction of a servo signal with high accuracy can be realized. Thereby, an operation rate can be improved and productivity comes to improve.

Hereinafter, details of a servo writer according to an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
In the drawings to be referred to, FIG. 1 is a configuration diagram conceptually showing a servo writer according to a first embodiment of the present invention, FIG. 2A is a schematic side view showing the overall configuration around the head, and FIG. 2 (b) is a schematic diagram as viewed in the direction of arrow A in FIG.

First, the overall configuration of the servo writer 10 will be described with reference to FIG. The servo writer 10 includes a delivery reel 11 for delivering the magnetic tape MT, and a take-up reel 12 for taking up the magnetic tape MT from the delivery reel 11. On the downstream side of the delivery reel 11 and the upstream side of the take-up reel 12, for example, a servo write head H1 for writing a servo signal having a C-shaped servo pattern is disposed.
On the upstream side and the downstream side of the servo write head H1, tape guides 13 and 13 are provided for causing the magnetic tape MT to travel along the servo write head H1. Also, a verify head H2 for inspecting the servo signal written by the servo write head H1 is provided between the tape guide 13 and the take-up reel 12 on the downstream side. The servo writer 10 includes various devices such as a tension adjusting device T for adjusting the tension of the magnetic tape MT to a predetermined tension, a tension detecting device (not shown), and a guide R for guiding the traveling of the magnetic tape MT. A device is provided.

  In such a servo writer 10, the magnetic tape MT delivered from the delivery reel 11 is run along a predetermined path by the rotation of the capstan roller while being guided by each guide R, and a servo signal from the servo write head H1. Is recorded and the servo signal is reproduced by the verify head H2, and then wound around the take-up reel 12.

Next, the structure and arrangement around the servo write head H1 will be described in detail. As shown in FIG. 2A, a cantilevered support arm 20 is provided on a reference side (hereinafter referred to as a base portion) 10 a of the servo writer 10, and a free end 20 a of the support arm 20 is provided at the free end 20 a. A servo write head H1 is provided. The support arm 20 has adjustment mechanisms D1 to D4 for adjusting the position of the servo write head H1 with respect to the magnetic tape MT as described later. A sensor 30 is provided at the free end 20a of the support arm 20 as detection means for detecting the position of the edge MT1 of the magnetic tape MT. A head adjustment unit 40 (position adjustment means) for adjusting the position of the free end 20a with respect to the base portion 10a is provided below the free end 20a.
As shown in FIG. 2B, the tape guides 13 and 13 are rotatably provided via the support members 14 and 14, and are flanges for suppressing the deflection of the magnetic tape MT in the tape width direction. 13a and 13b, respectively.

  As shown in FIG. 2B, the servo write head H1 includes a head surface H11 that is in sliding contact with the recording surface of the magnetic tape MT. The head surface H11 causes a servo signal to be generated on the servo band of the magnetic tape MT. It comes to record.

  The servo write head H1 incorporates a coil wound around a head core (not shown) and has a magnetic gap having a predetermined pattern on the head surface H11. Then, a servo current recording pulse current is supplied from a servo signal supply circuit (not shown) via a conductive wire or the like, and a magnetic layer (not shown) of the magnetic tape MT is magnetized by a leakage magnetic flux from the magnetic gap, A servo signal for controlling the position of the read head of the recording / reproducing apparatus is written. The servo signal is written on a servo band (not shown) arranged along the longitudinal direction of the magnetic tape MT.

The support arm 20 includes a base portion 20b fixed to the base portion 10a and first to fourth arms 21 to 24 having adjustment mechanisms D1 to D4, and the position of the servo write head H1 with respect to the magnetic tape MT. The configuration is such that adjustment can be performed.
The first arm 21 is provided so as to be movable in a direction perpendicular to the base portion 10a (horizontal direction indicated by an arrow X in the figure: the width direction of the magnetic tape MT), and its position adjustment is performed by an adjustment mechanism D1. This is done by adjusting. The adjustment mechanism D1 includes an adjustment knob D11 and an adjustment screw D12 that is rotated by a rotation operation of the adjustment knob D11. In the rotation direction of the adjustment screw D12 that is rotated by the rotation operation of the adjustment knob D11. In addition, the first arm 21 moves forward and backward in the direction of the arrow X in the figure.

  The second arm 22 is suspended from and attached to the tip of the first arm 21 and is perpendicular to the first arm 21 (vertical direction indicated by an arrow Z in the figure: the thickness of the magnetic tape MT). The wrap angle of the servo write head H1 can be adjusted. The position adjustment of the second arm 22 includes an adjustment knob D21 and an adjustment screw D22 that is rotated by a rotation operation of the adjustment knob D21, and the adjustment screw that is rotated by a rotation operation of the adjustment knob D11. The second arm 22 moves up and down in the direction of arrow Z in the drawing in accordance with the rotation direction of D22.

  The third arm 23 is provided on the base portion 10a side on the side of the lower end of the second arm 22, and as shown in FIG. 2B, the adjustment mechanism D3 causes the servo light head H1 to move in the azimuth direction ( The rotation adjustment in the direction indicated by arrow Y in the figure is possible. The third arm 23 engages with a support member 23a fixed to the second arm 22 and a concave arc portion 23b of the support member 23a, and is a convex arc portion that is slidable along the arc shape. 23c. The convex arc portion 23c is formed with an arc-shaped worm wheel 23d that protrudes toward the concave arc portion 23b. The adjustment mechanism D3 includes an adjustment knob D31 and a worm gear D32 that is rotated by a rotation operation of the adjustment knob D31 and meshes with the worm wheel 23d. Thus, when the adjustment knob D31 is turned, the convex arc portion 23c moves in a circular motion in accordance with the turning direction, and the turning adjustment of the servo light head H1 in the azimuth direction is performed.

  The fourth arm 24 is provided so as to hang down to the base portion 10a side which is the end portion of the third arm 23, and as shown in FIG. 2A, a lower portion which becomes the free end 20a of the support arm 20 A servo write head H1 is provided on the human side (the side opposite to the base 10a side). The fourth arm 24 is rotatably provided in the turning direction of the servo write head H1 (the direction indicated by the arrow B in the figure) by the adjusting mechanism D4 provided on the third arm 23. The fourth arm 24 is fixed to a convex arcuate portion 23g engaged with a concave arcuate portion 23f provided in the connecting portion 23e of the third arm 23. The convex arc portion 23g is formed with an arc-shaped worm wheel 23h that protrudes toward the concave arc portion 23f. The adjustment mechanism D4 includes an adjustment knob D41, a bevel gear mechanism D42 that is rotated by a rotation operation of the adjustment knob D41, and a worm gear D43 that rotates via the bevel gear mechanism D42 and meshes with the worm wheel 23h. ing. Thus, when the adjustment knob D41 is rotated, the convex arcuate portion 23g performs an arc motion in accordance with the rotation direction, and the rotation adjustment of the servo light head H1 in the turning direction is performed.

  The sensor 30 includes an emitting unit 31 that emits light applied to the edge MT1 of the magnetic tape MT, and a light receiving unit 32 that receives the light emitted from the emitting unit 31, and a current corresponding to the light receiving area of the light. By detecting this, the position of the edge MT1 is detected. In such a sensor 30, when the magnetic tape MT is slightly lower than a predetermined position (position where the magnetic tape MT is arranged at the center of the head surface H11 of the servo write head H1), the emitted light of the emitting unit 31 is emitted. Is blocked by the edge MT1 of the magnetic tape MT, and the current value detected by the light receiving 32 becomes small. On the other hand, when the magnetic tape MT is slightly higher than a predetermined position, the ratio of the light emitted from the light emitting portion 31 being blocked by the edge MT1 of the magnetic tape MT is reduced and detected by the light receiving 32. The current value increases. The current value detected by the sensor 30 in this way is sent to the control unit 45 (see FIG. 2B). Note that the wire harness leading to the sensor 30 can be routed to the base portion 10 a along the support arm 20.

  The control unit 45 receives the current value from the sensor 30 and performs drive control of the head adjustment unit 40 based on the current value. In this case, the control unit 45 stores, as a reference current value, a current value that serves as a reference when the servo write head H1 and the magnetic tape MT are adjusted to the predetermined position, and manufactures the magnetic tape MT by running it. The current value input from the sensor 30 after the start is compared with the reference current value, and whether the current value input from the sensor 30 is large or not, the + side (human side) or the − side (base portion 10a). It is possible to grasp whether or not the magnetic tape MT has shifted to the side). Here, since the current value from the sensor 30 may be constantly changing (vibrating (see FIG. 4)) due to the running vibration of the magnetic tape MT, the control unit 45 determines the current value up to a predetermined time before. Is calculated, and the calculated current value is grasped as the current value from the sensor 30. When it is determined that the magnetic tape MT has been displaced, the head adjuster 40 is driven and controlled to return to the predetermined position to adjust the position of the servo write head H1. Further, the control unit 45 is not configured to grasp the positional deviation and immediately control the driving of the head adjustment unit 40, and when the control unit 45 deviates from the predetermined position to the + side or the − side by a certain amount or more. In addition, a threshold value is set so that the drive control of the head adjustment unit 40 is performed. That is, even when the positional relationship between the servo write head H1 and the magnetic tape MT is shifted and the current value from the sensor 30 fluctuates, when the fluctuation ratio is within the threshold range, the head adjustment unit 40 Drive control is not performed. When the threshold value is exceeded, the head adjustment unit 40 is driven and controlled. In the present embodiment, specifically, the threshold value of the current value is set so that the positional deviation between the servo write head H1 and the magnetic tape MT is within a range of ± 10 μm. Incidentally, as a product defect, a range exceeding ± 20 μm can be given as one defective area.

The head adjustment unit 40 includes a drive motor 41 and a support shaft 42 that is rotationally driven by the drive motor 41 and configured to be able to move in and out of the drive motor 41. The drive motor 41 is attached in a state where most of the main body is embedded in the base portion 10a. The drive motor 41 can be a stepping motor or the like, and preferably has a large reduction ratio. The support shaft 42 has a total length with which the tip end abuts against the bottom surface of the free end 20 a of the support arm 20. The support shaft 42 is made of a hard material, such as ceramic, without affecting the servo signal writing by the servo write head H1. Further, the tip of the support shaft 42 is formed in a spherical shape (not shown), and is in point contact with the free end 20a. As a result, the contact of the support shaft 42 with the free end 20a does not affect the inclination of the servo write head H1 (the inclination by adjusting the azimuth angle and the turn angle). That is, the tilt adjustment of the servo write head H1 can be performed without any trouble. Note that the tip of the support shaft 42 may be formed of a hard material such as ceramic.
When the head adjustment unit 40 is driven and controlled, the position of the free end 20 a is adjusted in the axial direction of the support shaft 42 as the support shaft 42 is moved back and forth. Note that various actuators may be used in place of the drive motor 41.

In such a servo writer 10, the position adjustment of the servo write head H1 can be performed as follows, for example.
First, the adjustment mechanisms D1 to D4 of the support arm 20 adjust the positions of the first to fourth arms 21 to 24, so that the servo write head H1 is accurately positioned with respect to the magnetic tape MT (the predetermined position). Adjust so that For the adjustment of the support arm 20, it is desirable to repeatedly perform a test so that the servo signal is accurately written by the servo write head H1, and in such adjustment, the accurate position of the servo write head H1 is found. It is preferable to make it. The adjustment so far is preferably performed in a state where the bottom surface portion of the free end 20 a does not contact the tip end portion of the support shaft 42 of the head adjustment portion 40.

  Next, after the support arm 20 is adjusted, the adjustment knob D11 of the first adjustment mechanism D1 is rotated to adjust the position of the first arm 21 in the direction approaching the base portion 10a. Here, for example, the first arm 21 is moved by 150 μm in a direction approaching the base portion 10a. By this movement, the bottom surface of the free end 20a comes into contact with the tip of the support shaft 42.

Thereafter, the drive motor 41 of the head adjustment unit 40 is driven by a manual controller or the like (not shown) to rotate the rotating shaft 42 so that the free end 20a protrudes 150 μm toward the human side.
As a result, the free end 20a of the support arm 20 is held in a state where it is pressed toward the base portion 10a via the rotary shaft 42 and the drive motor 41. In this case, the amount of movement of the support arm 20 whose position has been adjusted in advance is restored by the drive adjustment of the drive motor 41, so that the accurate position of the servo write head H1 with respect to the magnetic tape MT can be ensured. it can.

FIG. 3 is a graph showing an effect when the position correction between the servo write head H1 and the magnetic tape MT is performed using the servo writer 10 of the present embodiment. In the graph shown in FIG. 3, the vertical axis represents the rate of change when the reference current value is “0”, and the horizontal axis represents time t.
As a measuring method, as shown in FIGS. 2A and 2B, the sensor 30 is used to measure the reference current value at the predetermined position, the current value is set to “0”, and the magnetic tape MT is run. The manufacturing was performed, and the positional deviation of the edge MT1 of the magnetic tape MT was measured. The threshold value is actually set as a current value, but here, it is expressed as a value of the rate of change on the graph and set to ± 0.6.

  In FIG. 3, it can be seen that the amount of deviation (relative position between the servo write head H1 and the magnetic tape MT) gradually increases with time t. Then, when the rate of change reaches 0.6 (threshold value: a position indicated by a symbol (A) in FIG. 3), position adjustment is performed. In this case, the control unit 45 (see FIG. 2B) grasps the fact from the current value from the sensor 30, and drives and controls the head adjustment unit 40. As a result, as indicated by the symbol (B) in FIG. 3, it can be seen that the servo write head H1 (FIGS. 2A and 2B) has been returned almost to the predetermined position.

That is, by using the servo writer 10 of this embodiment, even if a situation occurs in which the deviation between the servo write head H1 and the magnetic tape MT gradually increases with the lapse of time t, this is detected by the sensor 30. Under the control of the control unit 45, the head adjustment unit 40 controls the drive so that the servo write head H1 is returned to the predetermined position. As a result, the position adjustment (position correction) between the servo write head H1 and the magnetic tape MT is automatically performed.
Therefore, as in the prior art, it is possible to avoid problems such as producing defective products without knowing misalignment, and productivity is improved. Further, the servo signal position shift at the time of writing can be minimized (within the threshold value range), and high-quality servo signal writing can be realized.

  Here, as described above, the control unit 45 controls the drive of the head adjustment unit 40 when the current value from the sensor 30 exceeds the threshold value. You may comprise so that position adjustment may be performed regularly. Alternatively, the position adjustment may be performed manually at a desired time.

According to the servo writer 10 of the present embodiment described above, since the support arm 20 is cantilevered by the base portion 10a and is provided so that the position can be adjusted, the position adjustment of the free end 20a of the support arm 20 is performed. And the position of the servo write head H1 relative to the magnetic tape MT can be adjusted.
Further, the position of the edge MT1 of the traveling magnetic tape MT is detected by the sensor 30, and the relative position of the servo write head H1 with respect to the magnetic tape MT according to the position of the edge MT1 detected by the head adjustment unit 40. The position is adjusted. As a result, the servo signal can be accurately recorded at a predetermined position on the magnetic tape MT.

  Further, since the position of the edge MT1 is detected in the vicinity of the servo write head H1, the positional deviation of the magnetic tape MT with respect to the servo write head H1 can be detected almost accurately.

  Since the head adjustment unit 40 is configured to be able to adjust the facing distance between the base unit 10a and the free end 20a of the support arm 20, the servo write head H1 can be directly adjusted by driving the head adjustment unit 40. it can. Thereby, highly accurate position adjustment can be performed.

  Further, since the head adjustment unit 40 is driven and controlled when the position of the edge MT1 detected by the sensor 30 reaches the predetermined position, for example, when a positional deviation occurs beyond a range where no product defect occurs. The position of the servo write head H1 with respect to the magnetic tape MT can be adjusted by driving and controlling the head adjustment unit 40. That is, frequent position adjustment is prevented in a range of misalignment that does not cause product defects. Thereby, management of position adjustment can be simplified.

(Second Embodiment)
FIG. 4 is a schematic diagram showing the periphery of the servo write head of the servo writer 10 according to the second embodiment of the present invention. This embodiment is different from the first embodiment in that the position adjusting means is provided in the tape guides 13 and 13, and the position adjusting means is provided around the free end 20 a of the support arm 20. Other than that, the rest is identical.

  As shown in FIG. 4, the tape guides 13 and 13 are provided on the base portion 10 a via tape guide adjustment portions 60 and 60. Both of the tape guide adjusting units 60 and 60 have a motor 61 and a rotating shaft 62. The motor 61 is attached in a state where most of the main body is embedded in the base portion 10a. As the motor 61, a stepping motor or the like can be used, and a motor having a large reduction ratio is preferably used. A male screw is formed on the rotary shaft 62, and this male screw is screwed into a female screw (not shown) formed on the support member 14 of the tape guide 13. Thus, when the tape guide adjusting unit 60 is driven and controlled, the tape guides 13 and 13 are moved in the tape width direction of the magnetic tape MT (the axial direction of the tape guides 13 and 13) according to the rotation direction of the rotary shaft 62. The position is adjusted. Note that various actuators may be used in place of the motor 61. Such tape guide adjustment units 60 and 60 are driven by the drive control of the control unit 45 as in the first embodiment.

  According to the servo writer 10 of this embodiment, when the tape guide adjusting units 60 and 60 are driven, the position of the tape guides 13 and 13 is adjusted in the width direction of the magnetic tape MT, and the position adjustment is performed with respect to the servo write head H1. The relative position of the magnetic tape MT is adjusted to a predetermined position. That is, the position of the tape guides 13 and 13 is directly adjusted, and the relative position of the magnetic tape MT with respect to the servo write head H1 is adjusted. As a result, the servo signal can be accurately recorded at a predetermined position on the magnetic tape MT.

  As mentioned above, although embodiment which concerns on this invention was described, it cannot be overemphasized that this invention is not limited to these, and can change suitably according to the main point of invention. For example, in the above embodiment, the servo write head H1 side has been described. However, the verify head H2 side may be configured similarly.

It is a block diagram which shows notionally the servo writer based on the 1st Embodiment of this invention. (A) is a schematic side view showing the overall configuration around the head, and (b) is a schematic view as seen from the arrow A in FIG. It is the graph which showed the mode of the effect when position correction with servo write head H1 and magnetic tape MT was performed using the servo writer of this embodiment. It is a schematic diagram showing the periphery of the servo write head of the servo writer according to the second embodiment of the present invention. It is explanatory drawing of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Servo writer 10a Base part 13 Tape guide 20 Support arm 20a Free end 21-24 The 1st-4th arm 30 Sensor 40 Head adjustment part (position adjustment means)
45 Control unit 60 Tape guide adjustment unit (position adjustment means)
D1 to D4 Adjustment mechanism H1 Servo write head H11 Head surface MT Magnetic tape MT1 Edge

Claims (4)

A servo writer provided with a head for recording or reproducing servo signals on a traveling tape,
A base portion, and a support arm that is cantilevered by the base portion and has a head that is provided at a free end so that the position of the head can be adjusted with respect to the tape;
Detecting means for detecting the position of the edge of the tape at a position near the head;
Position adjusting means for adjusting a relative position between the tape and the head;
A control unit for controlling the relative position by the position adjusting unit according to the position of the edge detected by the detecting unit;
A servo writer characterized by comprising:   2. The servo writer according to claim 1, wherein the position adjustment unit includes a head adjustment unit configured to be able to adjust a facing distance between the base unit and the free end of the support arm.   The position adjusting means includes a tape guide adjusting unit configured to adjust the position of a pair of tape guides arranged on both sides of the head along the running direction of the tape in the width direction of the tape. The servo writer according to claim 1.   4. The drive control according to claim 1, wherein the position adjustment unit is driven and controlled when the position of the edge detected by the detection unit reaches a predetermined position. 5. Servo writer.

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